configure: fix licence check function

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18717 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -1737,7 +1737,7 @@ fi
 
 
 die_license_disabled() {
-    enabled $1 || enabled $2 && die "$2 is $1 and --enable-$1 is not specified."
+    enabled $1 || { enabled $2 && die "$2 is $1 and --enable-$1 is not specified."; }
 }
 
 die_license_disabled gpl libfaad2