patch 8.1.2312: "line:" field in tags file not used

Problem:    "line:" field in tags file not used.
Solution:   Recognize the field and use the value. (Andy Massimino, Daniel
            Hahler, closes #5232, closes #2546, closes #1057)
diff --git a/src/version.c b/src/version.c
index 35969b5..2f0316f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2312,
+/**/
     2311,
 /**/
     2310,