treewide: Make explicit that 'dev' output of gst_all_1.gst-plugins-base is used

pkgs/desktops/enlightenment/efl.nix

···
   patches = [ ./efl-elua.patch ];
 
   preConfigure = ''
-    export PKG_CONFIG_PATH="${gst_all_1.gst-plugins-base}/lib/pkgconfig/gstreamer-video-0.10.pc:$PKG_CONFIG_PATH"
+    export PKG_CONFIG_PATH="${gst_all_1.gst-plugins-base.dev}/lib/pkgconfig/gstreamer-video-0.10.pc:$PKG_CONFIG_PATH"
     export LD_LIBRARY_PATH="$(pwd)/src/lib/eina/.libs:$LD_LIBRARY_PATH"
   '';
 

pkgs/misc/emulators/retrofe/default.nix

···
   configurePhase = ''
     cmake RetroFE/Source -BRetroFE/Build -DCMAKE_BUILD_TYPE=Release \
       -DVERSION_MAJOR=0 -DVERSION_MINOR=0 -DVERSION_BUILD=0 \
-      -DGSTREAMER_BASE_INCLUDE_DIRS='${gst_all_1.gst-plugins-base}/include/gstreamer-1.0'
+      -DGSTREAMER_BASE_INCLUDE_DIRS='${gst_all_1.gst-plugins-base.dev}/include/gstreamer-1.0'
   '';
 
   buildPhase = ''