patch 8.2.2307: a shell command in the vimrc causes terminal output

Problem:    A shell command in the vimrc causes terminal output.
Solution:   Do not call starttermcap() after a shell command if the termcap
            wasn't active before.
diff --git a/src/version.c b/src/version.c
index 1945a4a..3f8ed2a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2307,
+/**/
     2306,
 /**/
     2305,