configure: remove stray semicolon

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22445 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -315,7 +315,7 @@ filter(){
 map(){
     m=$1
     shift
-    for _; do; eval $m; done
+    for _; do eval $m; done
 }
 
 set_all(){