Clean up macOS support

SourceS/macos_stdarg.h

@@ -1,27 +1,9 @@
-#if defined(__MACH__)
 #ifndef __STDARG_H
 #define __STDARG_H
 
-#ifndef _VA_LIST_T
 typedef __builtin_va_list va_list;
 #define _VA_LIST_T
-#endif
 #define va_start(ap, param) __builtin_va_start(ap, param)
 #define va_end(ap)          __builtin_va_end(ap)
-#define va_arg(ap, type)    __builtin_va_arg(ap, type)
-
-/* GCC always defines __va_copy, but does not define va_copy unless in c99 mode
- * or -ansi is not specified, since it was not part of C90.
- */
-#define __va_copy(d,s) __builtin_va_copy(d,s)
-
-#if __STDC_VERSION__ >= 199900L || __cplusplus >= 201103L || !defined(__STRICT_ANSI__)
-#define va_copy(dest, src)  __builtin_va_copy(dest, src)
-#endif
-
-/* Hack required to make standard headers work, at least on Ubuntu */
-#define __GNUC_VA_LIST 1
-typedef __builtin_va_list __gnuc_va_list;
 
 #endif /* __STDARG_H */
-#endif

SourceS/miniwin.h

@@ -4,7 +4,7 @@
 #include <fcntl.h>
 #include <math.h>
 // work around https://reviews.llvm.org/D51265
-#ifdef __MACH__
+#ifdef __APPLE__
 #include "macos_stdarg.h"
 #else
 #include <stdarg.h>