security: Add "explicit" markers for one-parameter constructors

Change-Id: I072c924ecdd212d63700804e8af3f4fac6da1919
Refs: #1681
diff --git a/src/security/sec-rule-specific.hpp b/src/security/sec-rule-specific.hpp
index 83af8fb..ade4b0c 100644
--- a/src/security/sec-rule-specific.hpp
+++ b/src/security/sec-rule-specific.hpp
@@ -37,8 +37,10 @@
   SecRuleSpecific(shared_ptr<Regex> dataRegex,
                   shared_ptr<Regex> signerRegex);
 
+  explicit
   SecRuleSpecific(shared_ptr<Regex> dataRegex);
 
+  explicit
   SecRuleSpecific(const SecRuleSpecific& rule);
 
   virtual