glib: move bash completions to right outputs

Previously, bash completion scripts were installed in the "out"
output, which didn't contain any binaries. With this change, the
completion scripts are installed in the outputs containing the
corresponding binaries. Namely, gapplication, gdbus, gio, and
gsettings completion scripts go to $bin, and gresource to $dev. The
result is that the completions work out of the box, when the binaries
are available to the user.

pkgs/development/libraries/glib/default.nix

@@ -169,6 +169,12 @@ stdenv.mkDerivation rec {
     # This file is *included* in gtk3 and would introduce runtime reference via __FILE__.
     sed '1i#line 1 "${pname}-${version}/include/glib-2.0/gobject/gobjectnotifyqueue.c"' \
       -i "$dev"/include/glib-2.0/gobject/gobjectnotifyqueue.c
+    for i in $bin/bin/*; do
+      moveToOutput "share/bash-completion/completions/''${i##*/}" "$bin"
+    done
+    for i in $dev/bin/*; do
+      moveToOutput "share/bash-completion/completions/''${i##*/}" "$dev"
+    done
   '' + optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
     cp -r ${buildPackages.glib.devdoc} $devdoc
   '';