Suppress the Wredundant-decls warning in another set of openssl headers

src/tools/tor-gencert.c

@@ -13,6 +13,20 @@
 #include <unistd.h>
 #endif
 
+#ifdef __GNUC__
+#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+#endif
+
+#if __GNUC__ && GCC_VERSION >= 402
+#if GCC_VERSION >= 406
+#pragma GCC diagnostic push
+#endif
+/* Some versions of OpenSSL declare X509_STORE_CTX_set_verify_cb twice in
+ * x509.h and x509_vfy.h. Suppress the GCC warning so we can build with
+ * -Wredundant-decl. */
+#pragma GCC diagnostic ignored "-Wredundant-decls"
+#endif
+
 #include <openssl/evp.h>
 #include <openssl/pem.h>
 #include <openssl/rsa.h>
@@ -20,6 +34,14 @@
 #include <openssl/obj_mac.h>
 #include <openssl/err.h>
 
+#if __GNUC__ && GCC_VERSION >= 402
+#if GCC_VERSION >= 406
+#pragma GCC diagnostic pop
+#else
+#pragma GCC diagnostic warning "-Wredundant-decls"
+#endif
+#endif
+
 #include <errno.h>
 #if 0
 #include <stdlib.h>