Build LLVM with -Wstrict-prototypes enabled

Clang 5 supports -Wstrict-prototypes. We should use it to catch any C
declarations that declare a non-prototype function.

rdar://33705313

Differential Revision: https://reviews.llvm.org/D36669


git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@312240 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed