tls: proper check of libssl versions used for compilation and availab…

…le on system

- shift out the last 12bits, being the patch version and status (see man
  SSLeay)
- reported by Victor Seva, GH #662

(cherry picked from commit c38b4c7)
(cherry picked from commit 253909b)
(cherry picked from commit 5632abc)
(cherry picked from commit 0a5f99b)
(cherry picked from commit 35c3099)

modules/tls/tls_init.c

@@ -503,8 +503,10 @@ int init_tls_h(void)
 #endif
 	ssl_version=SSLeay();
 	/* check if version have the same major minor and fix level
-	 * (e.g. 0.9.8a & 0.9.8c are ok, but 0.9.8 and 0.9.9x are not) */
-	if ((ssl_version>>8)!=(OPENSSL_VERSION_NUMBER>>8)){
+	 * (e.g. 0.9.8a & 0.9.8c are ok, but 0.9.8 and 0.9.9x are not)
+	 * - values is represented as 0xMMNNFFPPS: major minor fix patch status
+	 *   0x00090705f == 0.9.7e release */
+	if ((ssl_version>>12)!=(OPENSSL_VERSION_NUMBER>>12)){
 		LOG(L_CRIT, "ERROR: tls: init_tls_h: installed openssl library "
 				"version is too different from the library the ser tls module "
 				"was compiled with: installed \"%s\" (0x%08lx), compiled "