Revert "fix CMakeLists.txt"

Author: wangyu-

CMakeLists.txt

@@ -8,17 +8,6 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 set(CMAKE_CXX_STANDARD 11)
 
-execute_process(COMMAND git rev-parse HEAD
-                OUTPUT_VARIABLE GIT_VER
-                OUTPUT_STRIP_TRAILING_WHITESPACE
-                ERROR_QUIET)
-if (GIT_VER STREQUAL "")
-  set(GIT_VER "unknown")
-endif()
-file(WRITE git_version.h "const char *gitversion = \"${GIT_VER}\";")
-
-file(REMOVE makefile)
-
 set(SOURCE_FILES
         main.cpp 
         lib/md5.cpp