st: Configure St to match its namespace version to Mutter

St has been stuck at version 1.0, which makes it difficult to
version API documentation.

Configure it to build with the same namespace version as
Mutter, so documentation and API changes can be tracked.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2674>

src/st/meson.build

@@ -180,7 +180,7 @@ st_cflags = [
 ]
 
 # Currently meson requires a shared library for building girs
-libst = shared_library('st-1.0',
+libst = shared_library('st-' + mutter_api_version,
   sources: st_gir_sources + st_nogir_sources + croco_sources,
   c_args: st_cflags,
   dependencies: [clutter_dep, mutter_dep, libxml_dep, gdk_pixbuf_dep, m_dep],
@@ -212,7 +212,7 @@ endif
 
 libst_gir = gnome.generate_gir(libst,
   sources: st_gir_sources,
-  nsversion: '1.0',
+  nsversion: mutter_api_version,
   namespace: 'St',
   includes: [
     'Clutter-' + mutter_api_version,