Split <stdio.h> out of <cstdio>.

As with <stddef.h>, skip our custom header if __need_FILE or __need___FILE is defined.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@249798 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed