patch 9.1.0519: MS-Windows: libvterm compilation can be optimized

Problem:  MS-Windows: libvterm compilation can be optimized
Solution: Enable batch inference for libvterm (Ken Takata)

Enable batch inference for libvterm by using $(OBJDIR)/libvterm as the
object directory. This should make the compilation process a bit faster.

closes: #15118

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 2391e5b..966088d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    519,
+/**/
     518,
 /**/
     517,