Update bbappends to match version in current oe-core master
g-ir-tools-native: do not install m4 macros and makefile

The introspection.m4 and Makefile.introspection files are provided by
the gtk-doc-stub-native package. We don't care about these for native packages,
since introspection is disabled, so remove them from files we install.
gst-plugins-base: fix introspection breakage in pbutils