patch 8.2.1487: Travis: installing snd-dummy is not always useful

Problem:    Travis: installing snd-dummy is not always useful.
Solution:   Only install snd-dummy on amd64. (Ozaki Kiichi, closes #6738)

.travis.yml

@@ -69,7 +69,11 @@ _anchors:
         fi
     before_script:
       - sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0
-      - sudo bash ci/load-snd-dummy.sh || true
+      # It appears we can load "snd-dummy" on only amd64.
+      - |
+        if [[ "${TRAVIS_CPU_ARCH}" = amd64 ]]; then
+          sudo bash ci/load-snd-dummy.sh || true
+        fi
       - sudo usermod -a -G audio $USER
       - do_test() { sg audio "sg $(id -gn) '$*'"; }
 

ci/load-snd-dummy.sh

@@ -3,6 +3,6 @@ set -e
 
 if ! modprobe snd-dummy; then
     # snd-dummy is contained in linux-modules-extra (if exists)
-    apt install -y "linux-modules-extra-$(uname -r)"
+    apt-get install -yq --no-install-suggests --no-install-recommends "linux-modules-extra-$(uname -r)"
     modprobe snd-dummy
 fi

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1487,
 /**/
     1486,
 /**/