patch 8.0.0987: terminal: second byte of double-byte char wrong

Problem:    terminal: second byte of double-byte char wrong
Solution:   Set the second byte to NUL only for utf-8 and non-multibyte.
diff --git a/src/version.c b/src/version.c
index 6baf62b..6d2de86 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    987,
+/**/
     986,
 /**/
     985,