patch 9.0.1297: wrong value for $LC_CTYPE makes the environ test fail

Problem:    Wrong value for $LC_CTYPE makes the environ test fail.
Solution:   Unset $LC_CTYPE when running tests. (closes #11963)
diff --git a/src/testdir/test_environ.vim b/src/testdir/test_environ.vim
index d834481..b5dbdce 100644
--- a/src/testdir/test_environ.vim
+++ b/src/testdir/test_environ.vim
@@ -73,7 +73,7 @@
   " If $LANG is not set then the system locale will be used.
   " Run Vim after unsetting all the locale environmental vars, and capture the
   " output of :lang.
-  let lang_results = system("unset LANG; unset LC_MESSAGES; " ..
+  let lang_results = system("unset LANG; unset LC_MESSAGES; unset LC_CTYPE; " ..
             \ shellescape(v:progpath) ..
             \ " --clean -esX -c 'redir @a' -c 'lang' -c 'put a' -c 'print' -c 'qa!' ")
 
diff --git a/src/version.c b/src/version.c
index 4213800..26b4048 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1297,
+/**/
     1296,
 /**/
     1295,