Revert of 214418:
"Create a default symver on Linux like ELF OSes."

Fails the build under Debian with ld.gold:
/usr/bin/ld.gold: --default-symver: unknown option




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214482 91177308-0d34-0410-b5e6-96231b3b80d8