fix another typo in the gstmoz plugin makefile
gstmoz: remove some extraneous includes/imports
gstmoz: revert/undo preprocessing of gst_libs files in stub
gstmoz: define needed vars for GST_PLUGIN_DEFINE

We could probably get rid of the config.h imports as well, unless we
want to use config.h to define the vars later.
gstmoz: link xul and add linker flags to find libxpcom.so at runtime