Fix: ensure git is always run from the project directory

When trying to obtain the version hash

cmake/getversion.cmake

@@ -2,6 +2,7 @@ find_package(Git)
 if(GIT_FOUND)
 	execute_process(
 		COMMAND ${GIT_EXECUTABLE} describe --long --always
+		WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
 		RESULT_VARIABLE res_var
 		OUTPUT_VARIABLE GIT_COM_ID
 	)