gnu: godot: Update to 4.2.1.

The previous version failed to build after an update to glslang.  Godot looks
for an include, Types.h, which is no longer included in the built glslang.
Use the included glslang (which will match the included vulkan, too) for now.

* gnu/packages/game-development.scm (godot): Update to 4.2.1.
[source]: In snippet add (preserve) amd-fsr2, clipper2, glslang (for now), and
libktx.
[arguments]: Comment out "builtin_glslang=no" in #:scons-flags (for now).

Change-Id: I8f6c20e3796ea96f2e6a6a167063f10a667bd4c3

gnu/packages/game-development.scm

@@ -2095,7 +2095,7 @@ scripted in a Python-like language.")
 (define-public godot
   (package
     (name "godot")
-    (version "4.1.3")
+    (version "4.2.1")
     (source (origin
               (method git-fetch)
               (uri (git-reference
@@ -2104,7 +2104,7 @@ scripted in a Python-like language.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "1mwwzf77ixkalciqakn6q42g9sl2570didfll406sfs42wz534ng"))
+                "0d5y678986lx4a4xjkxs5glh2dckp8wwl3r3mw72inq7gvaa18s3"))
               (modules '((guix build utils)
                          (ice-9 ftw)
                          (srfi srfi-1)))
@@ -2117,19 +2117,28 @@ scripted in a Python-like language.")
                     (let* ((preserved-files
                             '("README.md"
                               "amd-fsr"
+                              "amd-fsr2"
                               "assimp"
                               "astcenc"
                               "basis_universal"
                               ;; Godot needs ca-certificates.crt, but that is
                               ;; not available in build environment
                               "certs"
+                              "clipper2"
                               "cvtt"
                               "linuxbsd_headers"
                               "etc2comp"
                               "etcpak"
                               "fonts"
                               "glad"
+                              ;; TODO: Remove once Godot once again builds
+                              ;; with our glslang package, or with a
+                              ;; workaround.  Currently it looks for a Types.h
+                              ;; which is no longer in the glslang output
+                              ;; after the most recent update.
+                              "glslang"
                               "jpeg-compressor"
+                              "libktx"
                               "libsimplewebm"
                               "meshoptimizer"
                               "minimp3"
@@ -2170,7 +2179,9 @@ scripted in a Python-like language.")
                         "builtin_embree=no"
                         "builtin_enet=no"
                         "builtin_freetype=no"
-                        "builtin_glslang=no"
+                        ;; TODO: Uncomment this option when the todo for
+                        ;; glslang in the snippet is resolved.
+                        ;; "builtin_glslang=no"
                         "builtin_graphite=no"
                         "builtin_harfbuzz=no"
                         "builtin_icu4c=no"