gplugin/gplugin

Both tcc/ and vala/ were also referencing meson.build_root
feature/meson-subproject-fix
2019-08-12, Gary Kramlich
6354bdbff214
Both tcc/ and vala/ were also referencing meson.build_root
shared_library('gplugin-license-check',
'gplugin-license-check.c',
name_prefix : '',
dependencies : [gplugin_dep],
install : true,
install_dir : join_paths(get_option('libdir'), 'gplugin'))