Port "merged and expanded settings from gd.h and gdft.c" (GH-17367)

This commit[1] and the related part of the Netware removal[2] move the
related definitions out of gd.h, and bring some updates.

[1] <libgd/libgd@2a921c8>
[2] <libgd/libgd@e6bb110>

Author: cmb69

ext/gd/libgd/gd.h

@@ -17,20 +17,6 @@ extern "C" {
 #define GD_EXTRA_VERSION ""
 #define GD_VERSION_STRING "2.0.35"
 
-#ifdef NETWARE
-/* default fontpath for netware systems */
-#define DEFAULT_FONTPATH "sys:/java/nwgfx/lib/x11/fonts/ttf;."
-#define PATHSEPARATOR ";"
-#elif defined(_WIN32)
-/* default fontpath for windows systems */
-#define DEFAULT_FONTPATH "c:\\winnt\\fonts;c:\\windows\\fonts;."
-#define PATHSEPARATOR ";"
-#else
-/* default fontpath for unix systems */
-#define DEFAULT_FONTPATH "/usr/X11R6/lib/X11/fonts/TrueType:/usr/X11R6/lib/X11/fonts/truetype:/usr/X11R6/lib/X11/fonts/TTF:/usr/share/fonts/TrueType:/usr/share/fonts/truetype:/usr/openwin/lib/X11/fonts/TrueType:/usr/X11R6/lib/X11/fonts/Type1:."
-#define PATHSEPARATOR ":"
-#endif
-
 /* gd.h: declarations file for the graphic-draw module.
  * Permission to use, copy, modify, and distribute this software and its
  * documentation for any purpose and without fee is hereby granted, provided

ext/gd/libgd/gdft.c

@@ -90,17 +90,27 @@ gdImageStringFT (gdImage * im, int *brect, int fg, char *fontlist,
  * some last resort values that might match some Un*x system
  * if building this version of gd separate from graphviz.
  */
+
 #ifndef DEFAULT_FONTPATH
-#if defined(__APPLE__) || (defined(__MWERKS__) && defined(macintosh))
-#define DEFAULT_FONTPATH "/usr/share/fonts/truetype:/System/Library/Fonts:/Library/Fonts"
-#else
-#define DEFAULT_FONTPATH "/usr/share/fonts/truetype"
-#endif
+#  if defined(_WIN32)
+#    define DEFAULT_FONTPATH "C:\\WINDOWS\\FONTS;C:\\WINNT\\FONTS"
+#  elif defined(__APPLE__) || (defined(__MWERKS__) && defined(macintosh))
+#    define DEFAULT_FONTPATH "/usr/share/fonts/truetype:/System/Library/Fonts:/Library/Fonts"
+#  else
+   /* default fontpath for unix systems  - whatever happened to standards ! */
+#    define DEFAULT_FONTPATH "/usr/X11R6/lib/X11/fonts/TrueType:/usr/X11R6/lib/X11/fonts/truetype:/usr/X11R6/lib/X11/fonts/TTF:/usr/share/fonts/TrueType:/usr/share/fonts/truetype:/usr/openwin/lib/X11/fonts/TrueType:/usr/X11R6/lib/X11/fonts/Type1:/usr/lib/X11/fonts/Type1:/usr/openwin/lib/X11/fonts/Type1"
+#  endif
 #endif
+
 #ifndef PATHSEPARATOR
-#define PATHSEPARATOR ":"
+#  if defined(_WIN32)
+#    define PATHSEPARATOR ";"
+#  else
+#    define PATHSEPARATOR ":"
+#  endif
 #endif
 
+
 #ifndef TRUE
 #define FALSE 0
 #define TRUE !FALSE