added override.sh support

.gitignore

@@ -10,3 +10,4 @@ scripts/cleanup.cmd
 scripts/cleanup.sh
 version.rc
 version.cpp
+override.sh

config.sh

@@ -41,3 +41,7 @@ PROJECT_MSYS2_PACKAGE_LIST+=()
 if [ "${PROJECT_ENABLE_TESTING}" == "ON" ]; then
   PROJECT_APP_LIST+=(${PROJECT_NAME}_test)
 fi
+
+if [ -f "./override.sh" ]; then
+  . ./override.sh
+fi