gnu: gtk: Fix build on aarch64.

* gnu/packages/gtk.scm (gtk)[arguments]<#:test-options>: Rename failing
test suite to match upstream change on aarch64-linux.

Change-Id: Ibdf03a94e71f72283a093cba6d5a328004defa5c
Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/gtk.scm

@@ -1171,7 +1171,7 @@ application suites.")
                 '("-Dgtk_doc=false")
                 '("-Dgtk_doc=true"))
          "-Dman-pages=true")
-      #:test-options '(list "--setup=x11" ;defaults to wayland
+      #:test-options #~(list "--setup=x11" ;defaults to wayland
                              ;; Use the same test options as upstream uses for
                              ;; their CI.
                              "--suite=gtk"
@@ -1183,7 +1183,17 @@ application suites.")
                              ;; also disabled these, see:
                              ;; https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1050075
                              "--no-suite=wayland_failing"
-                            "--no-suite=wayland_gles_failing")
+
+                             ;; The correct name of the test that fails on
+                             ;; AArch64 is 'wayland_gles2_failing':
+                             ;; <https://gitlab.gnome.org/GNOME/gtk/-/commit/b916c4dac1075572>.
+                             ;; The second arm of the 'if' is kept to avoid a
+                             ;; rebuild on other architectures.  TODO: Remove
+                             ;; on the next rebuild cycle.
+                             #$(if (and (not (%current-target-system))
+                                        (string=? (%current-system) "aarch64-linux"))
+                                   "--no-suite=wayland_gles2_failing"
+                                   "--no-suite=wayland_gles_failing"))
       #:phases
       #~(modify-phases %standard-phases
           (add-after 'unpack 'generate-gdk-pixbuf-loaders-cache-file