equix: Disable huge page support by default

Equi-X supports optionally allocating its solver memory using huge
pages, to reduce the virtual memory subsystem overhead required to make
the entire solver buffer live.

Tor doesn't use this feature, since it seems to have no noticeable
performance benefit at this time, but we still included code for it at
compile time. To improve portability, this patch disables huge page
support by default and enables it only in the cmake build system used
for equix benchmarks.

With this patch equix-bench still supports huge pages. Verified using
strace that we're making the hugepage allocation.

There's no fallback for huge pages, so Equi-X initialization will fail
if they are requested and we don't support them for any runtime or
compile-time reason.

Addresses #40843 (NetBSD) but also prevents future porting issues
related to huge pages.

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