gitignore: add tools/uncoded_frame

Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

.gitignore

@@ -80,4 +80,5 @@
 /tools/qt-faststart
 /tools/trasher
 /tools/seek_print
+/tools/uncoded_frame
 /tools/zmqsend