gplugin/gplugin

Look for python3-embed and if we don't find it fallback python3. This fixes and issue with python3.8
shared_library('gplugin-license-check',
'gplugin-license-check.c',
name_prefix : '',
dependencies : [gplugin_dep],
install : true,
install_dir : join_paths(get_option('libdir'), 'gplugin'))