Add OpenSSL support to steam_rsa.c

Also modified the various project files to use OpenSSL and removed NSS configuration. The readme has also been updated.
Search for Adium Frameworks recursively in builddir

The name of the build directory depends on what configuration is being built. Searching recursively avoids having to specify an exact build directory name.
Link libz the Xcode way
Rewrite dylib fixing script to be more flexible

Also added a linker flag to ensure the dylib renaming can be done successfully.