libgaminggear: apply workaround for missing hb.h

Same issue as https://github.com/NixOS/nixpkgs/pull/75789

pkgs/development/libraries/libgaminggear/default.nix

@@ -1,5 +1,6 @@
 { stdenv, fetchurl, cmake, pkgconfig, gettext
 , gtk2, libcanberra, libnotify, pcre, sqlite, xorg
+, harfbuzz
 }:
 
 stdenv.mkDerivation rec {
@@ -27,6 +28,9 @@ stdenv.mkDerivation rec {
     "-DINSTALL_LIBDIR=lib"
   ];
 
+  # https://sourceforge.net/p/libgaminggear/discussion/general/thread/b43a776b3a/
+  NIX_CFLAGS_COMPILE = [ "-I${harfbuzz.dev}/include/harfbuzz" ];
+
   postFixup = ''
     moveToOutput bin "$bin"
   '';