[builds/windows] Guard some non-ancient API.

We can support Windows 98 and NT 4.0 in principle...

* builds/windows/ftdebug.c, builds/windows/ftsystem.c: Check for the
ancient SDK using _WIN32_WINDOWS, _WIN32_WCE, or _WIN32_WINNT.

builds/windows/ftdebug.c

@@ -136,6 +136,8 @@
 
     va_start( ap, fmt );
     vfprintf( stderr, fmt, ap );
+#if ( defined( _WIN32_WINNT ) && _WIN32_WINNT >= 0x0400 ) || \
+    ( defined( _WIN32_WCE )   && _WIN32_WCE   >= 0x0600 )
     if ( IsDebuggerPresent() )
     {
       static char  buf[1024];
@@ -144,6 +146,7 @@
       vsnprintf( buf, sizeof buf, fmt, ap );
       OutputDebugStringA( buf );
     }
+#endif
     va_end( ap );
   }
 
@@ -159,6 +162,8 @@
 
     va_start( ap, fmt );
     vfprintf( stderr, fmt, ap );
+#if ( defined( _WIN32_WINNT ) && _WIN32_WINNT >= 0x0400 ) || \
+    ( defined( _WIN32_WCE )   && _WIN32_WCE   >= 0x0600 )
     if ( IsDebuggerPresent() )
     {
       static char  buf[1024];
@@ -167,6 +172,7 @@
       vsnprintf( buf, sizeof buf, fmt, ap );
       OutputDebugStringA( buf );
     }
+#endif
     va_end( ap );
 
     exit( EXIT_FAILURE );

builds/windows/ftsystem.c

@@ -233,6 +233,10 @@
                         dwFlagsAndAttributes, hTemplateFile );
   }
 
+#endif
+
+#if defined( _WIN32_WCE ) || defined ( _WIN32_WINDOWS ) || \
+    !defined( _WIN32_WINNT ) || _WIN32_WINNT <= 0x0400
 
   FT_LOCAL_DEF( BOOL )
   GetFileSizeEx( HANDLE         hFile,
@@ -248,7 +252,7 @@
       return TRUE;
   }
 
-#endif /* _WIN32_WCE */
+#endif
 
 
   /* documentation is in ftobjs.h */