win32: Add/update a handful of defines for Win32 without MinGW/Cygwin.

* Thanks to Windows.h, BOOL must be an int on win32.

legacy_malloc.c

@@ -14,7 +14,7 @@ void *objc_atomic_malloc(size_t size)
 	return malloc(size);
 }
 
-#ifdef __MINGW32__
+#if defined(__MINGW32__) || defined(_WINDOWS)
 void *objc_valloc(size_t size)
 {
 	return malloc(size);

mutation.m

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "objc/runtime.h"
+#include "visibility.h"
 
 static void objc_enumeration_mutation_fallback(id object)
 {
@@ -13,7 +14,7 @@ static void objc_enumeration_mutation_fallback(id object)
 // This function is exported as a weak symbol to enable GNUstep or some other
 // framework to replace it trivially. On platforms with linkers that cannot handle weak exports,
 // the objc_enumeration_mutation hook is the preferred override point.
-void __attribute__((weak)) objc_enumerationMutation(id obj)
+void WEAK_EXPORT objc_enumerationMutation(id obj)
 {
 	_objc_enumeration_mutation(obj);
 }

objc/runtime.h

@@ -127,7 +127,11 @@ typedef signed char BOOL;
 #		ifdef __vxwords
 typedef  int BOOL;
 #		else
+#           if defined(_WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
+typedef int BOOL;
+#           else
 typedef unsigned char BOOL;
+#           endif
 #		endif
 #	endif
 

spinlock.h

@@ -1,4 +1,4 @@
-#ifdef __MINGW32__
+#if defined(__MINGW32__) || defined(_WINDOWS)
 #include <windows.h>
 static unsigned sleep(unsigned seconds)
 {

visibility.h

@@ -22,3 +22,4 @@
 
 #define LIKELY(x) __builtin_expect(x, 1)
 #define UNLIKELY(x) __builtin_expect(x, 0)
+#define WEAK_EXPORT __attribute__((weak))