Forward-port changelog from 0.3.4.7-rc

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+Changes in version 0.3.4.7-rc - 2018-08-24
+  Tor 0.3.4.7-rc fixes several small compilation, portability, and
+  correctness issues in previous versions of Tor. This version is a
+  release candidate: if no serious bugs are found, we expect that the
+  stable 0.3.4 release will be (almost) the same as this release.
+
+  o Minor features (bug workaround):
+    - Compile correctly on systems that provide the C11 stdatomic.h
+      header, but where C11 atomic functions don't actually compile.
+      Closes ticket 26779; workaround for Debian issue 903709.
+
+  o Minor features (continuous integration):
+    - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
+    - Enable macOS builds in our Travis CI configuration. Closes
+      ticket 24629.
+    - Install libcap-dev and libseccomp2-dev so these optional
+      dependencies get tested on Travis CI. Closes ticket 26560.
+    - Only post Appveyor IRC notifications when the build fails.
+      Implements ticket 27275.
+    - Run asciidoc during Travis CI. Implements ticket 27087.
+    - Use ccache in our Travis CI configuration. Closes ticket 26952.
+
+  o Minor features (continuous integration, rust):
+    - Use cargo cache in our Travis CI configuration. Closes
+      ticket 26952.
+
+  o Minor features (directory authorities):
+    - Authorities no longer vote to make the subprotocol version
+      "LinkAuth=1" a requirement: it is unsupportable with NSS, and
+      hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
+
+  o Minor features (geoip):
+    - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
+      Country database. Closes ticket 27089.
+
+  o Minor bugfixes (compilation, windows):
+    - Don't link or search for pthreads when building for Windows, even
+      if we are using build environment (like mingw) that provides a
+      pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
+
+  o Minor bugfixes (continuous integration):
+    - Improve Appveyor CI IRC logging. Generate correct branches and
+      URLs for pull requests and tags. Use unambiguous short commits.
+      Fixes bug 26979; bugfix on master.
+    - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
+    - Pass the module flags to distcheck configure, and log the flags
+      before running configure. (Backported to 0.2.9 and later as a
+      precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
+
+  o Minor bugfixes (in-process restart):
+    - Always call tor_free_all() when leaving tor_run_main(). When we
+      did not, restarting tor in-process would cause an assertion
+      failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
+
+  o Minor bugfixes (linux seccomp2 sandbox):
+    - Fix a bug in out sandboxing rules for the openat() syscall.
+      Previously, no openat() call would be permitted, which would break
+      filesystem operations on recent glibc versions. Fixes bug 25440;
+      bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
+
+  o Minor bugfixes (onion services):
+    - Fix bug that causes services to not ever rotate their descriptors
+      if they were getting SIGHUPed often. Fixes bug 26932; bugfix
+      on 0.3.2.1-alpha.
+
+  o Minor bugfixes (portability):
+    - Fix compilation of the unit tests on GNU/Hurd, which does not
+      define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
+      from "paulusASol".
+
+  o Minor bugfixes (rust):
+    - Backport test_rust.sh from master. Fixes bug 26497; bugfix
+      on 0.3.1.5-alpha.
+    - Consistently use ../../.. as a fallback for $abs_top_srcdir in
+      test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
+    - Protover parsing was accepting the presence of whitespace in
+      version strings, which the C implementation would choke on, e.g.
+      "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
+    - Protover parsing was ignoring a 2nd hyphen and everything after
+      it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
+      on 0.3.3.1-alpha.
+    - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
+      $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
+    - cd to ${abs_top_builddir}/src/rust before running cargo in
+      src/test/test_rust.sh. This makes the working directory consistent
+      between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
+
+  o Minor bugfixes (testing, bootstrap):
+    - When calculating bootstrap progress, check exit policies and the
+      exit flag. Previously, Tor would only check the exit flag, which
+      caused race conditions in small and fast networks like chutney.
+      Fixes bug 27236; bugfix on 0.2.6.3-alpha.
+
+  o Minor bugfixes (testing, openssl compatibility):
+    - Our "tortls/cert_matches_key" unit test no longer relies on
+      OpenSSL internals. Previously, it relied on unsupported OpenSSL
+      behavior in a way that caused it to crash with OpenSSL 1.0.2p.
+      Fixes bug 27226; bugfix on 0.2.5.1-alpha.
+
+  o Minor bugfixes (Windows, compilation):
+    - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
+      27185; bugfix on 0.2.2.2-alpha.
+
+
 Changes in version 0.3.4.6-rc - 2018-08-06
   Tor 0.3.4.6-rc fixes several small compilation, portability, and
   correctness issues in previous versions of Tor. This version is a