Reorder x86_64 tests

So that darwin and cygwin/mingw are tested before the generic check --
which allows them to actually be set.
Work around LLVM ABI problem on x86-64
Fix pkgconfig install bits
Release candidate 1
Bump soversion
Fix man page. Clean out junk.
Fixes for AIX xlc compiler.
Fix GCC usage test and update README
Remove a.out cruft from dist
x32 and libtool fixes
Add libtool-ldflags. Define toolexeclibdir for non-GCC builds.
Add cache flushing routine for sun compiler on sparc solaris 2.8
Update bug report address. rc2.
Fix botched sparc patch. Update version.
Fix microblaze big-endian struct issue
sparc v9 fixes for sun tools
Add missing files to dist
Fix many.c testcase for ppc
More man page cleanup
Fix typo