[Support] Fix build under Emscripten
Summary:
Emscripten's libc doesn't define MNT_LOCAL, thus causing a build
failure in the fallback path. However, to the best of my knowledge,
it also doesn't support remote file system mounts, so we may simply
return `true` here (as we do for e.g. Fuchsia). With this fix, the
core LLVM libraries build correctly under emscripten (though some
of the tools and utils do not).
Reviewers: kripken
Differential Revision: https://reviews.llvm.org/D63688
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364143
91177308-0d34-0410-b5e6-
96231b3b80d8
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