Clean up OpenSSL engine list when OpenSSL 1.0.2 used

Attempt to fix GH-8620.

Author: bukka

NEWS

@@ -11,6 +11,10 @@ PHP                                                                        NEWS
 - MySQLnd:
   . Fixed potential heap corruption due to alignment mismatch. (cmb)
 
+- OpenSSL:
+  . Fixed missing clean up of OpenSSL engine list - attempt to fix GH-8620.
+    (Jakub Zelenka)
+
 - PDO_ODBC:
   . Fixed bug GH-9372 (HY010 when binding overlong parameter). (cmb)
 

ext/openssl/openssl.c

@@ -61,6 +61,10 @@
 #include <openssl/param_build.h>
 #endif
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L && !defined(OPENSSL_NO_ENGINE)
+#include <openssl/engine.h>
+#endif
+
 /* Common */
 #include <time.h>
 
@@ -1312,6 +1316,11 @@ PHP_MSHUTDOWN_FUNCTION(openssl)
 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined (LIBRESSL_VERSION_NUMBER)
 	EVP_cleanup();
 
+#ifndef OPENSSL_NO_ENGINE
+	/* Free engine list initialized by OPENSSL_config */
+	ENGINE_cleanup();
+#endif
+
 	/* prevent accessing locking callback from unloaded extension */
 	CRYPTO_set_locking_callback(NULL);
 	/* free allocated error strings */