Use __attribute__((fallthrough)) rather than magic GCC comments.

GCC added an implicit-fallthrough warning a while back, where it
would complain if you had a nontrivial "case:" block that didn't end
with break, return, or something like that.  Clang recently added
the same thing.

GCC, however, would let you annotate a fall-through as intended by
any of various magic "/* fall through */" comments.  Clang, however,
only seems to like "__attribute__((fallthrough))".  Fortunately, GCC
accepts that too.

A previous commit in this branch defined a FALLTHROUGH macro to do
the right thing if GNUC is defined; here we replace all of our "fall
through" comments with uses of that macro.

This is an automated commit, made with the following perl one-liner:

  #!/usr/bin/perl -i -p
  s#/\* *falls? ?thr.*?\*/#FALLTHROUGH;#i;

(In order to avoid conflicts, I'm applying this script separately to
each maint branch. This is the 0.4.2 version.)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/test/test_socks.c b/src/test/test_socks.c
index a4a768ce84..6d3ebd2320 100644
--- a/src/test/test_socks.c
+++ b/src/test/test_socks.c
@@ -778,7 +778,7 @@ test_socks_truncated(void *ptr)
   for (i = 0; i < ARRAY_LENGTH(commands); ++i) {
     for (j = 0; j < commands[i].len; ++j) {
       switch (commands[i].setup) {
-        default: /* Falls through */
+        default: FALLTHROUGH;
         case NONE:
           /* This test calls for no setup on the socks state. */
           break;