meson: Do not auto build rawimporter when building gluploader

No need to auto build rawimporter if we are building gluploader as it
will be always loaded on startup, but never used.

Skip the build of it when its meson option is set to "auto".

lib/gst/plugin/importers/meson.build

@@ -1,21 +1,13 @@
 gst_clapper_gl_base_importer_dep = dependency('', required: false)
 
-if not get_option('rawimporter').disabled()
-  library(
-    'gstclapperrawimporter',
-    'gstclapperrawimporter.c',
-    dependencies: gst_clapper_sink_dep,
-    include_directories: configinc,
-    c_args: gst_clapper_plugin_args,
-    install: true,
-    install_dir: gst_clapper_importers_libdir,
-  )
-endif
-
 plugin_needs_gl_base = (
   not get_option('glimporter').disabled()
   or not get_option('gluploader').disabled()
 )
+plugin_gl_support_required = (
+  get_option('glimporter').enabled()
+  or get_option('gluploader').enabled()
+)
 
 gst_plugin_gl_deps = [gstgl_dep, gstglproto_dep]
 have_gtk_gl_windowing = false
@@ -39,6 +31,10 @@ if gst_gl_have_window_wayland and gst_gl_have_platform_egl
   endif
 endif
 
+if plugin_gl_support_required and not have_gtk_gl_windowing
+  error('GL-based importer was enabled, but support for current GL windowing is missing')
+endif
+
 if gst_gl_have_platform_egl
   gst_plugin_gl_deps += gstglegl_dep
 endif
@@ -48,11 +44,9 @@ gst_clapper_gl_base_importer_deps = [
 ] + gst_plugin_gl_deps
 
 foreach dep : gst_clapper_gl_base_importer_deps
-  if not dep.found() or not have_gtk_gl_windowing
+  if not dep.found()
-    if get_option('glimporter').enabled()
+    if plugin_gl_support_required
-      error('GL importer was enabled, but required dependencies were not found')
+      error('GL-based importer was enabled, but required dependencies were not found')
-    elif get_option('gluploader').enabled()
-      error('GL uploader was enabled, but required dependencies were not found')
     endif
     plugin_needs_gl_base = false
   endif
@@ -73,7 +67,12 @@ if plugin_needs_gl_base
   )
 endif
 
-if not get_option('glimporter').disabled() and gst_clapper_gl_base_importer_dep.found()
+build_glimporter = (
+  not get_option('glimporter').disabled()
+  and gst_clapper_gl_base_importer_dep.found()
+)
+
+if build_glimporter
   library(
     'gstclapperglimporter',
     'gstclapperglimporter.c',
@@ -85,7 +84,12 @@ if not get_option('glimporter').disabled() and gst_clapper_gl_base_importer_dep.
   )
 endif
 
-if not get_option('gluploader').disabled() and gst_clapper_gl_base_importer_dep.found()
+build_gluploader = (
+  not get_option('gluploader').disabled()
+  and gst_clapper_gl_base_importer_dep.found()
+)
+
+if build_gluploader
   library(
     'gstclappergluploader',
     'gstclappergluploader.c',
@@ -96,3 +100,21 @@ if not get_option('gluploader').disabled() and gst_clapper_gl_base_importer_dep.
     install_dir: gst_clapper_importers_libdir,
   )
 endif
+
+# No need to auto build rawimporter if we are building gluploader
+build_rawimporter = (
+  not get_option('rawimporter').disabled()
+  and (not build_gluploader or get_option('rawimporter').enabled())
+)
+
+if build_rawimporter
+  library(
+    'gstclapperrawimporter',
+    'gstclapperrawimporter.c',
+    dependencies: gst_clapper_sink_dep,
+    include_directories: configinc,
+    c_args: gst_clapper_plugin_args,
+    install: true,
+    install_dir: gst_clapper_importers_libdir,
+  )
+endif