patch 7.4.1944

Problem:    Win32: Cannot compile with XPM feature using VC2015
Solution:   Add XPM libraries compiled with VC2015, and enable to build
            gvim.exe which supports XPM using VC2015. (Ken Takata)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1944,
 /**/
     1943,
 /**/