Patch from Robert de Bath to ifdef out the Windows-specific hack for

the offset horizontal line characters in the VT100 line-drawing set
(o,p,r,s), so that no trace of it - and hence no pointless performance
hit - is compiled into the cross-platform modules on non-Windows
platforms.

[originally from svn r9467]

windows/window.c

@@ -3371,6 +3371,7 @@ void do_text_internal(Context ctx, int x, int y, wchar_t *text, int len,
     if (attr & ATTR_NARROW)
 	nfont |= FONT_NARROW;
 
+#ifdef USES_VTLINE_HACK
     /* Special hack for the VT100 linedraw glyphs. */
     if (text[0] >= 0x23BA && text[0] <= 0x23BD) {
 	switch ((unsigned char) (text[0])) {
@@ -3395,6 +3396,7 @@ void do_text_internal(Context ctx, int x, int y, wchar_t *text, int len,
 	    force_manual_underline = 1;
 	}
     }
+#endif
 
     /* Anything left as an original character set is unprintable. */
     if (DIRECT_CHAR(text[0]) &&

windows/winstuff.h

@@ -145,6 +145,7 @@ typedef struct terminal_tag Terminal;
 #define TICKSPERSEC 1000	       /* GetTickCount returns milliseconds */
 
 #define DEFAULT_CODEPAGE CP_ACP
+#define USES_VTLINE_HACK
 
 typedef HDC Context;