openssl multiple threads optimization

package/libs/openssl/Config.in

@@ -49,6 +49,12 @@ config OPENSSL_ENGINE_DIGEST
 	bool
 	depends on OPENSSL_ENGINE_CRYPTO
 	prompt "Digests acceleration support"
+	
+config OPENSSL_THREADS
+	bool
+	prompt "Threading support"
+	default y
+	select PACKAGE_libpthread
 
 config OPENSSL_HARDWARE_SUPPORT
 	bool

package/libs/openssl/Makefile

@@ -35,6 +35,7 @@ PKG_CONFIG_DEPENDS:= \
 	CONFIG_OPENSSL_WITH_EC2M \
 	CONFIG_OPENSSL_WITH_SSL3 \
 	CONFIG_OPENSSL_HARDWARE_SUPPORT \
+	CONFIG_OPENSSL_THREADS \
 	CONFIG_OPENSSL_WITH_DEPRECATED \
 	CONFIG_OPENSSL_WITH_DTLS \
 	CONFIG_OPENSSL_WITH_COMPRESSION \
@@ -128,6 +129,12 @@ ifndef CONFIG_OPENSSL_HARDWARE_SUPPORT
   OPENSSL_OPTIONS += no-hw
 endif
 
+ifdef CONFIG_OPENSSL_THREADS
+  OPENSSL_OPTIONS += threads
+else
+  OPENSSL_OPTIONS += no-threads
+endif
+
 ifndef CONFIG_OPENSSL_WITH_DEPRECATED
   OPENSSL_OPTIONS += no-deprecated
 endif