The resulting Mac wX .app build is now completely independent and
redistributable, only needs to be codesigned.
Necessary dylibs are bundled and linked in a POST_BUILD step using
third_party_libs_tool (included) for which I created a separate repo
here as well:
http://github.com/rkitover/mac-third-party-libs-tool
Turn off Cairo on Mac because it does not work for now.
Set RPATH on the executable to @loader_path/../Frameworks, the bundling
tool also does this.
Update .gitignore for Finder .DS_Store files.
TOOD:
* write a ./quickbuild for Mac and other platforms such as msys2 and
linux