Add "ui_*.h" pattern to block auto-generated headers

moc automatically generates "ui_*.h" files for each *.ui file.
Since they are auto-generated I assume they should be ignored.

Signed-off-by: Alexey Brodkin <alexey.brodkin@gmail.com>

Qt.gitignore

@@ -16,5 +16,6 @@
 *.pro.user.*
 moc_*.cpp
 qrc_*.cpp
+ui_*.h
 Makefile*
 *-build-*