Revert r282483 - [cmake] Add linker option "-Wl,-z,defs" in standalone build

Revert r282483 as it causes build failures due to missing symbols when
not linking to -lgcc_s (i.e. doing pure LLVM stack build). The patch can
be reintroduced when the build system is fixed to add all needed
libraries (libunwind, compiler-rt).

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@282524 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed