patch 9.0.0398: members of funccall_T are inconsistently named

Problem:    Members of funccall_T are inconsistently named.
Solution:   Use the "fc_" prefix for all members.
diff --git a/src/version.c b/src/version.c
index 35184b2..a734b15 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    398,
+/**/
     397,
 /**/
     396,