freetype: changed the default font for OS X to 'Arial Unicode' (close #6087)

This appears to be the only sane font installed by default which supports at least Latin, Arabic, Traditional Chinese, Simplified Chinese, Japanese, Korean, Cyrillic, Vietnamese, Hebrew, Devanagari, Gujarati, Urdu, Tamil, Thai and Telugu

modules/text_renderer/freetype.c

@@ -46,8 +46,8 @@
 
 /* Default fonts */
 #ifdef __APPLE__
-# define DEFAULT_FONT_FILE "/Library/Fonts/Arial Black.ttf"
-# define DEFAULT_FAMILY "Arial Black"
+# define DEFAULT_FONT_FILE "/Library/Fonts/Arial Unicode.ttf"
+# define DEFAULT_FAMILY "Arial Unicode MS"
 #elif defined( WIN32 )
 # define DEFAULT_FONT_FILE "arial.ttf" /* Default path font found at run-time */
 # define DEFAULT_FAMILY "Arial"