add TIMEOUT 1 to git shortlog in configure script

For some reason executing git shortlog in Qt Creator cmake project
import hangs. This is a workaround so that it is still possible to
use Qt Creator without changing the normal build, in which git shortlog
will certainly complete in 1 second.

CMakeLists.txt

@@ -357,7 +357,8 @@ IF(GIT_FOUND)
 		COMMAND ${GIT_EXECUTABLE} shortlog -sne
 		COMMAND cut -c8-
 		OUTPUT_FILE ${CONTRIBUTORS}
-		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
+		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+		TIMEOUT 1)
 ENDIF(GIT_FOUND)
 
 SET(lmms_EMBEDDED_RESOURCES ${CMAKE_SOURCE_DIR}/AUTHORS ${CMAKE_SOURCE_DIR}/COPYING ${CONTRIBUTORS})