patch 8.1.0172: 'viminfofile' option does not behave like a file name

Problem:    'viminfofile' option does not behave like a file name.
Solution:   Add the P_EXPAND flag. (closes #3178)
diff --git a/src/version.c b/src/version.c
index 2821a1b..40f3b46 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    172,
+/**/
     171,
 /**/
     170,