meson: Do internal compilation with clapper warnings disabled

So we do not print deprecation warnings about our own
legacy APIs which are left for compatibility purposes

src/bin/clapper-app/meson.build

@@ -91,6 +91,7 @@ clapperapp_sources = [
 clapperapp_c_args = [
   '-DG_LOG_DOMAIN="ClapperApp"',
   '-DCLAPPER_APP_INTERNAL_COMPILATION',
+  '-DCLAPPER_DISABLE_DEPRECATION_WARNINGS',
   '-DGST_USE_UNSTABLE_API',
 ]
 

src/lib/clapper-gtk/meson.build

@@ -139,6 +139,7 @@ clappergtk_sources = [
 clappergtk_c_args = [
   '-DG_LOG_DOMAIN="ClapperGtk"',
   '-DCLAPPER_GTK_COMPILATION',
+  '-DCLAPPER_DISABLE_DEPRECATION_WARNINGS',
   '-DGST_USE_UNSTABLE_API',
 ]
 

src/lib/clapper/meson.build

@@ -171,6 +171,7 @@ clapper_sources = [
 clapper_c_args = [
   '-DG_LOG_DOMAIN="Clapper"',
   '-DCLAPPER_COMPILATION',
+  '-DCLAPPER_DISABLE_DEPRECATION_WARNINGS',
   '-DGST_USE_UNSTABLE_API',
   '-DG_SETTINGS_ENABLE_BACKEND',
 ]