Update config.{guess,sub} to their latest versions

Also changes permissions of the config.sub to 100644, it doesn't need to
be executable.

Thanks to Hendrik Jaeger (a.k.a. henk).
Remove deprecated acconfig.h file

Replace it with to AC_DEFINE directives in the configure.in file.

Thanks to Hendrik Jaeger (a.k.a. henk).
Replace compile symbolic link with actual file
Merge branch 'fix-autotools-issues'