package/wolfssl: bump to version 4.0.0

WolfSSL 4.0.0 has been released, it includes new features and fixes. The
full changelog is available here [1].

Update the wolfssl package to stable version 4.0.0, and the
corresponding hash file.

[1] https://www.wolfssl.com/docs/wolfssl-changelog/

Signed-off-by: Julien Grossholtz <julien.grossholtz@openest.io>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/wolfssl/wolfssl.hash

@@ -1,5 +1,5 @@
 # Locally computed:
-sha256 70e4fbeb91284a269b25a84fc526755c670475aee4034a6f237b1f754d108af3  v3.15.7-stable.tar.gz
+sha256 6cf678c72b485d1904047c40c20f85104c96b5f39778822783a2c407ccb23657  v4.0.0-stable.tar.gz
 
 # Hash for license files:
 sha256 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING

package/wolfssl/wolfssl.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-WOLFSSL_VERSION = 3.15.7
+WOLFSSL_VERSION = 4.0.0
 WOLFSSL_SITE = https://github.com/wolfSSL/wolfssl/archive
 WOLFSSL_SOURCE = v$(WOLFSSL_VERSION)-stable.tar.gz
 WOLFSSL_INSTALL_STAGING = YES