Enable -Wmissing-variable-declarations and
-Wincompatible-pointer-types-discards-qualifiers (the latter did not require
any code changes).

Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/apps/cms.c b/apps/cms.c
index 2331ea2..ae47341 100644
--- a/apps/cms.c
+++ b/apps/cms.c
@@ -95,7 +95,7 @@
 # define SMIME_SIGN_RECEIPT      (15 | SMIME_IP | SMIME_OP)
 # define SMIME_VERIFY_RECEIPT    (16 | SMIME_IP)
 
-int verify_err = 0;
+static int verify_err = 0;
 
 typedef struct cms_key_param_st cms_key_param;