Bug 1247056 - Don't default-enable alsa on Linux - r=kentuckyfriedtakahe

MozReview-Commit-ID: 8jC6JGrdlE1

--HG--
extra : rebase_source : 927c42fe210e6c00bb93d590c1f68e426b52e1da

old-configure.in

@@ -3252,13 +3252,8 @@ dnl ==================================
 dnl = Check alsa availability on Linux
 dnl ==================================
 
-dnl If using Linux, ensure that the alsa library is available
-if test "$OS_TARGET" = "Linux"; then
-    MOZ_ALSA=1
-fi
-
 MOZ_ARG_ENABLE_BOOL(alsa,
-[  --enable-alsa          Enable Alsa support (default on Linux)],
+[  --enable-alsa          Enable Alsa support],
    MOZ_ALSA=1,
    MOZ_ALSA=)