ARM: enable fast_unaligned when --cpu=armv[67] is specified

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19308 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -1882,6 +1882,10 @@ if test $cpu != "generic"; then
             add_cflags -mcpu=$cpu
             enable fast_unaligned
         ;;
+        armv[67]*)
+            add_cflags -march=$cpu
+            enable fast_unaligned
+        ;;
         armv*)
             add_cflags -march=$cpu
         ;;