use system/gtk default font on OS X, rather than specifying Lucida Grande; make large_bold_text use the LARGE size, not BIGGER

git-svn-id: svn://localhost/ardour2/branches/3.0@11205 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/ardour3_fonts.rc.in

@@ -47,7 +47,7 @@ style "red_medium_text" = "medium_text"
 
 style "large_bold_text"
 {
- 	font_name = "bold @FONT_BIGGER@"
+ 	font_name = "bold @FONT_LARGE@"
 }
 
 style "larger_text"

gtk2_ardour/wscript

@@ -476,7 +476,7 @@ def build(bld):
 
     # Set up font sizes
     if bld.is_defined('GTKOSX'): # OS X fonts
-        basefont = "Lucida Grande"
+        basefont = ""
         font_sizes = {
                 'TINY' : '7',
                 'SMALLER' : '9',