package/libopenssl: use HTTPS for URL

The host forces HTTPS regardless. This can be seen in the build logs:

 >>> host-libopenssl 1.0.2q Downloading
 URL transformed to HTTPS due to an HSTS policy
 --2018-12-10 09:53:27--  https://www.openssl.org/source/openssl-1.0.2q.tar.gz

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libopenssl/libopenssl.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 LIBOPENSSL_VERSION = 1.0.2q
-LIBOPENSSL_SITE = http://www.openssl.org/source
+LIBOPENSSL_SITE = https://www.openssl.org/source
 LIBOPENSSL_SOURCE = openssl-$(LIBOPENSSL_VERSION).tar.gz
 LIBOPENSSL_LICENSE = OpenSSL or SSLeay
 LIBOPENSSL_LICENSE_FILES = LICENSE