Handle NetBSD symbol renaming in msan_interceptors.cc

Summary:
NetBSD renames symbols for historical and compat reasons.

Add required symbol renames in sanitizer_common_interceptors.inc:

 - gettimeofday -> __gettimeofday50
 - getrusage -> __getrusage50
 - shmctl -> __shmctl50

Additionally handle sigaction symbol mangling.
Rename the function symbol in the file to SIGACTION_SYMNAME and define
it as __sigaction14 for NetBSD and sigaction for !NetBSD. We cannot use
simple renaming with the proprocessor, as there are valid fields named
sigaction and they must be left intact.

Sponsored by <The NetBSD Foundation>

Reviewers: joerg, eugenis, vitalybuka, dvyukov

Reviewed By: vitalybuka

Subscribers: kubamracek, llvm-commits, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D40766

llvm-svn: 319966