[cmake] fix deprecated OLD policy CMP0048 (#7193)

Author: 3nids

CMakeLists.txt

@@ -3,11 +3,10 @@ SET(CPACK_PACKAGE_VERSION_MINOR "1")
 SET(CPACK_PACKAGE_VERSION_PATCH "0")
 SET(COMPLETE_VERSION ${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH})
 SET(RELEASE_NAME "Master")
-IF (POLICY CMP0048) # in CMake 3.0.0+
-  CMAKE_POLICY (SET CMP0048 OLD) # keep PROJECT() from clearing VERSION variables
+IF (POLICY CMP0048)
+  CMAKE_POLICY (SET CMP0048 NEW)
 ENDIF (POLICY CMP0048)
-SET(PROJECT_VERSION ${COMPLETE_VERSION})
-PROJECT(qgis${PROJECT_VERSION})
+PROJECT(qgis VERSION ${COMPLETE_VERSION})
 IF (APPLE)
   SET(QGIS_APP_NAME "QGIS")
 ELSE (APPLE)