glib: add command man pages

This change adds man pages for commands provided by glib. Namely, the
$bin output now includes man pages (section 1) for:

   gapplication gdbus gio gsettings

The $dev output for:

   gdbus-codegen gio-querymodules glib-compile-resources
   glib-compile-schemas glib-genmarshal glib-gettextize glib-mkenums
   gobject-query gresource gtester-report gtester

pkgs/development/libraries/glib/default.nix

@@ -1,5 +1,5 @@
 { config, lib, stdenv, fetchurl, gettext, meson, ninja, pkg-config, perl, python3
-, libiconv, zlib, libffi, pcre, libelf, gnome, libselinux, bash, gnum4, gtk-doc, docbook_xsl, docbook_xml_dtd_45
+, libiconv, zlib, libffi, pcre, libelf, gnome, libselinux, bash, gnum4, gtk-doc, docbook_xsl, docbook_xml_dtd_45, libxslt
 # use util-linuxMinimal to avoid circular dependency (util-linux, systemd, glib)
 , util-linuxMinimal ? null
 , buildPackages
@@ -124,7 +124,7 @@ stdenv.mkDerivation rec {
     (buildPackages.meson.override {
       withDarwinFrameworksGtkDocPatch = stdenv.isDarwin;
     })
-    ninja pkg-config perl python3 gettext gtk-doc docbook_xsl docbook_xml_dtd_45 libxml2
+    ninja pkg-config perl python3 gettext gtk-doc docbook_xsl docbook_xml_dtd_45 libxml2 libxslt
   ];
 
   propagatedBuildInputs = [ zlib libffi gettext libiconv ];
@@ -135,6 +135,8 @@ stdenv.mkDerivation rec {
     "-Dgtk_doc=${boolToString (stdenv.hostPlatform == stdenv.buildPlatform)}"
     "-Dnls=enabled"
     "-Ddevbindir=${placeholder "dev"}/bin"
+  ] ++ optionals (!stdenv.isDarwin) [
+    "-Dman=true"                # broken on Darwin
   ];
 
   NIX_CFLAGS_COMPILE = toString [
@@ -171,6 +173,15 @@ stdenv.mkDerivation rec {
     cp -r ${buildPackages.glib.devdoc} $devdoc
   '';
 
+  # Move man pages to the same output as their binaries (needs to be
+  # done after preFixupHooks which moves man pages too - in
+  # _multioutDocs)
+  postFixup = ''
+    for i in $dev/bin/*; do
+      moveToOutput "share/man/man1/''${i##*/}.1.*" "$dev"
+    done
+  '';
+
   checkInputs = [ tzdata desktop-file-utils shared-mime-info ];
 
   preCheck = optionalString doCheck ''