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Create crtsavres.o for powerpc builds

Description

Create crtsavres.o for powerpc builds

Summary:
GCC expects to link in a crtsavres.o on powerpc platforms. On
powerpc64 this is an empty file, but on powerpc and powerpcspe this does contain
some save/restore functions, which may not actually be necessary for newer
modern GCC and clang. This appeases the in-tree gcc, though, and is needed in
order to switch to the BSD CRTRBEGIN.

PR: 233751
Reviewed By: andrew
Differential Revision: https://reviews.freebsd.org/D18826

Details