Update CMake script to generate zip/exe filenames which match love's new version naming scheme.

CMakeLists.txt

@@ -1805,7 +1805,7 @@ match_version("MAJOR" LOVE_VERSION_MAJOR)
 match_version("MINOR" LOVE_VERSION_MINOR)
 match_version("REV" LOVE_VERSION_REV)
 
-set(LOVE_VERSION_STR "${LOVE_VERSION_MAJOR}.${LOVE_VERSION_MINOR}.${LOVE_VERSION_REV}")
+set(LOVE_VERSION_STR "${LOVE_VERSION_MAJOR}.${LOVE_VERSION_MINOR}")
 
 message(STATUS "Version: ${LOVE_VERSION_STR}")