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

test/std/depr/depr.c.headers/stdio_h.pass.cpp

@@ -13,6 +13,26 @@
 #include <type_traits>
 #include "test_macros.h"
 
+#ifdef getc
+#error getc is defined
+#endif
+
+#ifdef putc
+#error putc is defined
+#endif
+
+#ifdef clearerr
+#error clearerr is defined
+#endif
+
+#ifdef feof
+#error feof is defined
+#endif
+
+#ifdef ferror
+#error ferror is defined
+#endif
+
 #ifndef BUFSIZ
 #error BUFSIZ not defined
 #endif