add object_script to Qt.gitignore

For template rules (modern style) in Qt project file,
this file is autogenerated by qmake.

Example old style (pro file):
SOURCES += src/1.cpp \
           src/2.cpp

Example new style, uses template rules (pro file):
SOURCES += src/*.cpp

qmake auto generate files with list of objects
object_script.*.Debug
object_script.*.Release

Qt.gitignore

@@ -12,6 +12,8 @@
 
 # Qt-es
 
+object_script.*.Release
+object_script.*.Debug
 *_plugin_import.cpp
 /.qmake.cache
 /.qmake.stash