lxqt.lxqt-build-tools: Fix finding GLib 2.72

Without this build of packages using this (e.g. lxqt.libqtxdg) will fail.

pkgs/desktops/lxqt/lxqt-build-tools/default.nix

@@ -22,11 +22,16 @@ mkDerivation rec {
     sha256 = "1hb04zgpalxv6da3myf1dxsbjix15dczzfq8a24g5dg2zfhwpx21";
   };
 
-  # Nix clang on darwin identifies as 'Clang', not 'AppleClang'
-  # Without this, dependants fail to link.
   postPatch = ''
+    # Nix clang on darwin identifies as 'Clang', not 'AppleClang'
+    # Without this, dependants fail to link.
     substituteInPlace cmake/modules/LXQtCompilerSettings.cmake \
       --replace AppleClang Clang
+
+    # GLib 2.72 moved the file from gio-unix-2.0 to gio-2.0.
+    # https://github.com/lxqt/lxqt-build-tools/pull/74
+    substituteInPlace cmake/find-modules/FindGLIB.cmake \
+      --replace gio/gunixconnection.h gio/gunixfdlist.h
   '';
 
   nativeBuildInputs = [