Fix typo in configure error message.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19803 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -1479,7 +1479,7 @@ fi
 tmpfile(){
     tmp=$(mktemp -u "${TMPDIR}/ffconf.XXXXXXXX")$2 &&
         (set -C; exec > $tmp) 2>/dev/null ||
-        die "Unable to create temoporary file in $TMPDIR."
+        die "Unable to create temporary file in $TMPDIR."
     append TMPFILES $tmp
     eval $1=$tmp
 }