cmake: clean up definition settings

CMakeLists.txt

@@ -25,11 +25,8 @@ if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.git")
     )
 endif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.git")
 
-SET(VERSION_GIT_COMMIT_FLAG "-DSWAY_GIT_VERSION=\"g${GIT_COMMIT_HASH}\"")
-add_definitions("${VERSION_GIT_COMMIT_FLAG}")
-
-SET(VERSION_GIT_BRANCH_FLAG "-DSWAY_GIT_BRANCH=\"${GIT_BRANCH}\"")
-add_definitions("${VERSION_GIT_BRANCH_FLAG}")
+add_definitions("-DSWAY_GIT_VERSION=\"g${GIT_COMMIT_HASH}\"")
+add_definitions("-DSWAY_GIT_BRANCH=\"${GIT_BRANCH}\"")
 
 string(TIMESTAMP CURRENT_DATE "%Y-%m-%d" UTC)
 add_definitions("-DSWAY_VERSION_DATE=${CURRENT_DATE}")