patch 9.1.0154: shm=F not respected when reloading buffer with 'autoread'

Problem:  shm=F not respected when reloading buffer with 'autoread'
Solution: Check SHM_FILEINFO in buf_check_timestamp()
          (Shougo Matsushita)

closes: #14144

Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 8ada658..0e02ea2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    154,
+/**/
     153,
 /**/
     152,