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shlibs: fall back to basename on macOS for relative paths. Fixes #222

Christoph Reiter requested to merge creiter/gobject-introspection:macos-shlibs-strip-rpath into master

On macOS we ideally want to write the final absolute path of the library into the gir and typelib. Up until now we inferred the install path from the .la file in case we used libtool and through otool in case we weren't using libtool hoping that the install_name was matching the install path.

meson currently sets the install_name of libraries to "@rpath/foo.dylib" and adds rpaths to the executables in the build dir. Only during install does it change the install_name to the absolute target path in all places.

Since we get called during build time we only get the @rpath from otool, which then makes things fail at runtime since the executables don't have the matching rpath set.

To make this somewhat work just fall back to the basename for relative paths, so we dlopen "foo.dylib" and depend on things being in /usr/local/lib or DYLD_FALLBACK_LIBRARY_PATH including the lib path (see man dlopen)

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