Fix 4 lines.
* typo. (endi -> endf)
* $VIM_CPP_INCLUDE_DIR initialized twice.
* wrong variable name (CPP_STDLIB -> VIM_CPP_STDLIB)
* wrong callback function name (CppVimrc(On)FileType_cpp, CppVimrc(On)Finish)
Merge pull request #2 from andcode365/fixthem

Fix 4 lines.