update external headers

ios/src/Log.h

@@ -0,0 +1,25 @@
+#ifdef __OBJC__
+#import <Foundation/Foundation.h>
+#elif defined __ANDROID__
+#include <android/log.h>
+#define LOGTAG "PolyvoxFilament"
+#else
+#include <stdio.h>
+#endif
+
+void Log(const char *fmt, ...) {    
+    va_list args;
+    va_start(args, fmt);
+    
+#ifdef __ANDROID__
+    __android_log_vprint(ANDROID_LOG_DEBUG, LOGTAG, fmt, args);
+#elif defined __OBJC__
+    NSString *format = [[NSString alloc] initWithUTF8String:fmt];
+    NSLogv(format, args);
+    [format release];
+#else
+    printf(fmt, args);
+#endif
+    
+    va_end(args);
+}