docs: explicitly declare gir build dependencies

As the path to the gir file is passed to hotdoc.generate_doc() and
not the build target itself, meson doesn't know about the dependency.

In turn, as the CI doesn't build everything before building the
documentation target, some gir files might not exist, for instance
in the case of gst-rtsp-server, causing the output documentation to
be empty.

The error occurred silently because hotdoc accepts wildcards for
*-sources arguments, thus it won't warn about a missing gir file as
it is legitimate for glob matching to resolve to nothing.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3686>

subprojects/gst-devtools/docs/meson.build

@@ -72,4 +72,5 @@ libs_doc = [hotdoc.generate_doc('gst-devtools',
     gi_sources: [validate_gir[0].full_path()],
     disable_incremental_build: true,
     dependencies : [validate_dep],
+    depends: validate_gir[0],
 )]

subprojects/gst-editing-services/docs/meson.build

@@ -108,6 +108,7 @@ libs_doc = [hotdoc.generate_doc('gst-editing-services',
     gi_order_generated_subpages: true,
     dependencies: [ges_dep],
     disable_incremental_build: true,
+    depends: ges_gir[0],
 )]
 
 plugins_doc = []

subprojects/gst-plugins-bad/docs/meson.build

@@ -198,6 +198,7 @@ foreach lib_def: libs
                 dependencies: [lib, gir],
                 c_flags: '-DGST_USE_UNSTABLE_API',
                 install: false,
+                depends: gir[0],
             )]
         endif
     else

subprojects/gst-plugins-base/docs/meson.build

@@ -168,6 +168,7 @@ foreach lib: libs
       gi_order_generated_subpages: true,
       dependencies: deps,
       install: false,
+      depends: gir[0],
   )]
 endforeach
 

subprojects/gst-rtsp-server/docs/meson.build

@@ -91,6 +91,7 @@ libs_doc = [hotdoc.generate_doc('gst-rtsp-server',
     gi_index: 'index.md',
     gi_smart_index: true,
     gi_order_generated_subpages: true,
+    depends: rtsp_server_gir[0],
 )]
 
 plugins_doc = [hotdoc.generate_doc('rtspclientsink',

subprojects/gstreamer/docs/meson.build

@@ -132,6 +132,7 @@ libs_doc = [hotdoc.generate_doc('gstreamer',
     gi_c_source_roots: [join_paths(meson.current_source_dir(), '../gst/'), ],
     dependencies: [gst_dep, gmodule_dep],
     extra_assets: [join_paths(meson.current_source_dir(), 'images')],
+    depends: gst_gir[0],
 )]
 
 libs = [
@@ -158,6 +159,7 @@ foreach lib: libs
       gi_order_generated_subpages: true,
       dependencies: deps,
       install: false,
+      depends: gir[0],
   )]
 endforeach