On SunOS4, we build `xc.c` by jumping through a lot of hoops to
perform a particular set of operations. We don't do that on other
platforms and this will help clean up the Linux and FreeBSD makefiles.
These directives were already not present in the macOS makefiles.
This is an internal macro to GNU libc and wasn't meant to be
defined like this. Well, it was. It was deprecated and removed
some years ago, so it isn't doing anything at all here now.
Be clear that the code is not clean for pointer aliasing.
modified: bin/makefile-darwin.386-x
modified: bin/makefile-darwin.x86_64-x
modified: bin/makefile-linux.386-x
modified: bin/makefile-linux.armv7l-x
modified: bin/makefile-linux.x86_64-x
modified: bin/makefile-sunos5.386-x