Log Message:
Add fixes for powerpc and alpha on NetBSD: ensure we have the
correct order of the include files, and use this also for i386 and
amd64 as well.  For alpha, move the Linux-specific settings into the
alpha/linux.h file.
Verified that this package now builds on powerpc.
This is largely the patches posted by maya@ on Jul 23, I just mirrored
the changes to include order to NetBSD/powerpc as well.  Thanks!
Bump PKGREVISION, bump to gcc5-libs to follow shortly.