patch 8.1.1999: calling both PlaySoundW() and PlaySoundA()

Problem:    Calling both PlaySoundW() and PlaySoundA().
Solution:   Only use PlaySoundW(). (Dan Thompson, closes #4903)
diff --git a/src/version.c b/src/version.c
index 634efd1..5ccaaec 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1999,
+/**/
     1998,
 /**/
     1997,