Fix building DynamicLibrary.cpp with musl libc
Summary:
The workaround added in rL301240 for stderr/out/in symbols being both
macros and globals is only necessary for glibc, and it does not compile
with musl libc. Alpine Linux has had the following fix for it:
https://git.alpinelinux.org/cgit/aports/plain/main/llvm4/llvm-fix-DynamicLibrary-to-build-with-musl-libc.patch
Adapt the fix in our DynamicLibrary.inc for Unix.
Reviewers: marsupial, chandlerc, krytarowski
Reviewed By: krytarowski
Subscribers: srhines, krytarowski, llvm-commits
Differential Revision: https://reviews.llvm.org/D33883
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304707
91177308-0d34-0410-b5e6-
96231b3b80d8
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