patch 9.0.1536: CI: sound dummy stopped working

Problem:    CI: sound dummy stopped working.
Solution:   Temporarily stop using sound dummy.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 84cb279..6d50f8c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -174,17 +174,18 @@
           sudo usermod -a -G audio "${USER}"
           sudo bash ci/setup-xvfb.sh
 
-      - name: Set up snd-dummy
-        if: (!(contains(matrix.extra, 'unittests') || contains(matrix.extra, 'vimtags')))
-        env:
-          DEST_DIR: ${{ env.TMPDIR }}/linux-modules-extra-${{ env.LINUX_VERSION }}
-        run: |
-          cd /lib/modules/${{ env.LINUX_VERSION }}
-          sudo apt-get install -d -y linux-modules-extra-${{ env.LINUX_VERSION }}
-          sudo dpkg -x /var/cache/apt/archives/linux-modules-extra-${{ env.LINUX_VERSION }}*.deb "${DEST_DIR}"
-          tar -cC "${DEST_DIR}"/lib/modules/${{ env.LINUX_VERSION }} kernel/sound | sudo tar -x
-          sudo depmod
-          sudo modprobe snd-dummy
+      # FIXME: Temporarily disabled because of build errors
+      # - name: Set up snd-dummy
+      #   if: (!(contains(matrix.extra, 'unittests') || contains(matrix.extra, 'vimtags')))
+      #   env:
+      #     DEST_DIR: ${{ env.TMPDIR }}/linux-modules-extra-${{ env.LINUX_VERSION }}
+      #   run: |
+      #     cd /lib/modules/${{ env.LINUX_VERSION }}
+      #     sudo apt-get install -d -y linux-modules-extra-${{ env.LINUX_VERSION }}
+      #     sudo dpkg -x /var/cache/apt/archives/linux-modules-extra-${{ env.LINUX_VERSION }}*.deb "${DEST_DIR}"
+      #     tar -cC "${DEST_DIR}"/lib/modules/${{ env.LINUX_VERSION }} kernel/sound | sudo tar -x
+      #     sudo depmod
+      #     sudo modprobe snd-dummy
 
       - name: Check autoconf
         if: contains(matrix.extra, 'unittests')
diff --git a/src/version.c b/src/version.c
index 8da355b..c8daf71 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1536,
+/**/
     1535,
 /**/
     1534,