meson: Drop support for -Wl,-M
meson: Drop support for -Wl,-M

This was originally introduced in c2fb8bfee309, reportedly to
support symbol versioning on Solaris; more recently, 30b301c6eaa9
ported it to meson.

Up until the previous commit this has resulted in passing

  -M .../libvirt/build/src/libvirt.syms

to the linker on macOS, but the implementation of the -M option
on that platform's linker is literally

  else if ( strcmp(arg, "-M") == 0 ) {
      // FIX FIX
  }

so in practice we've been providing an additional input file,
which the linker understandably ignores after printing a warning
since it's not in any format that it recognizes.

Considering that LLVM's linker, which is now used by default on
FreeBSD, supports the same --version-script option as the GNU
linker, that we have introduced special handling for macOS, and
that we don't target Solaris, we can simply drop the branch at
this point.

Signed-off-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

olafhering/libvirt,crobinso/libvirt,zippy2/libvirt,libvirt/libvirt,olafhering/libvirt,libvirt/libvirt,olafhering/libvirt,crobinso/libvirt,libvirt/libvirt,crobinso/libvirt,jfehlig/libvirt,libvirt/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,zippy2/libvirt,jfehlig/libvirt,crobinso/libvirt,zippy2/libvirt,jfehlig/libvirt