Fix the build with newish GCC

Reported by:	pointyhat (logs)

graphics/vertex/files/patch-disk.cpp

@@ -0,0 +1,27 @@
+--- vertex/disk.cpp.orig	Mon Nov  1 12:34:51 2004
++++ vertex/disk.cpp	Tue Jun 19 01:39:05 2007
+@@ -112,11 +112,7 @@
+ 	if(strptr == NULL)
+ 	{
+ 	    /* No drive notation, check if first char is a '\\' */
+-#if defined(__cplusplus) || defined(c_plusplus)
+ 	    while(ISBLANK(*path))
+-#else
+-	    while(ISBLANK((int)(*path)))
+-#endif
+ 		path++;
+ 
+ 	    return(*path == '\\');
+@@ -130,12 +126,7 @@
+ 	if(path == NULL)
+ 	    return(0);
+ 
+-	// Dan S: typecast is due to const.
+-#if defined(__cplusplus) || defined(c_plusplus)
+-	while(ISBLANK(reinterpret_cast<char>(*path)))
+-#else
+ 	while(ISBLANK(*path))
+-#endif
+ 	    path++;
+ 
+ 	return(*path == DIR_DELIMINATOR);