patch 8.0.0198: some syntax arguments take effect even after "if 0"

Problem:    Some syntax arguments take effect even after "if 0". (Taylor
            Venable)
Solution:   Properly skip the syntax statements.  Make "syn case" and "syn
            conceal" report the current state.  Fix that "syn clear" didn't
            reset the conceal flag.  Add tests for :syntax skipping properly.
diff --git a/src/version.c b/src/version.c
index 71c0450..d826cb3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    198,
+/**/
     197,
 /**/
     196,