package/systemd: doesn't build with libressl

systemd doesn't plan to fix the following build failure with libressl
(https://github.com/systemd/systemd/issues/14928) and ED25519 support
is still not available in libressl
(https://github.com/libressl-portable/portable/issues/393 opened for
more than 3 years):

../src/home/homed-manager.c: In function ‘manager_generate_key_pair’:
../src/home/homed-manager.c:1393:35: error: ‘EVP_PKEY_ED25519’ undeclared (first use in this function); did you mean ‘EVP_PKEY_DSA1’?
 1393 |         ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL);
      |                                   ^~~~~~~~~~~~~~~~
      |                                   EVP_PKEY_DSA1

Fixes:
 - http://autobuild.buildroot.org/results/47f31b36f123c4be4661f4fde2d1f7385c5d0ed5

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/systemd/Config.in

@@ -234,6 +234,7 @@ config BR2_PACKAGE_SYSTEMD_HOMED
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12 # fscrypt_key
 	select BR2_PACKAGE_CRYPTSETUP
 	select BR2_PACKAGE_OPENSSL
+	select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL
 	select BR2_PACKAGE_UTIL_LINUX_LIBFDISK
 	help
 	  systemd-homed is a system service that may be used to create,
@@ -412,6 +413,7 @@ config BR2_PACKAGE_SYSTEMD_RANDOMSEED
 config BR2_PACKAGE_SYSTEMD_REPART
 	bool "enable repart support"
 	select BR2_PACKAGE_OPENSSL
+	select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL
 	select BR2_PACKAGE_UTIL_LINUX_LIBFDISK
 	help
 	  systemd-repart grows and adds partitions to a partition table,

package/systemd/systemd.mk

@@ -498,7 +498,7 @@ else
 SYSTEMD_CONF_OPTS += -Dnss-resolve=false -Dresolve=false
 endif
 
-ifeq ($(BR2_PACKAGE_OPENSSL),y)
+ifeq ($(BR2_PACKAGE_LIBOPENSSL),y)
 SYSTEMD_CONF_OPTS += \
 	-Dgnutls=false \
 	-Dopenssl=true \