remove unnecessary backslashes

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@12302 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -962,7 +962,7 @@ find_things(){
     thing=$1
     pattern=$2
     file=$source_path/$3
-    sed -n "s/^[^#]*$pattern.*([^,]*, *\\([^,]*\\)\(,.*\)*).*/\\1_$thing/p" "$file"
+    sed -n "s/^[^#]*$pattern.*([^,]*, *\([^,]*\)\(,.*\)*).*/\1_$thing/p" "$file"
 }
 
 ENCODER_LIST=$(find_things  encoder  ENC      libavcodec/allcodecs.c)