Changes for AIX – Linking zlib statically to bootloader and pickup zlib correctly.

Commit 1e0e902:
For AIX machines without zlib installed (optional library on AIX), the bootloader needs zlib statically linked. 

Commits 845ae86, d9ccab1 and  41f956d:
Furthermore, even on machines with zlib the packaged Python program would fail when trying to resolve zlib on a machine, where it was not available as a shared object. The dependency analysis has been changed to not only pickup dependencies of the form 'archivelib.a(sharedobject.o)' but also to pickup 'sharedlib.so' (like e.g. 'libz.so').