package/uacme: ualpn needs libopenssl

ualpn is not compatible with libressl as stated by upstream in
https://github.com/ndilieto/uacme/commit/32546c7caa1626bbef860cf81e53d10e29fca5cb
resulting in the following build failure:

ualpn.c: In function 'ssl_client_hello_cb':
ualpn.c:2038:16: error: 'SSL_CLIENT_HELLO_RETRY' undeclared (first use in this function); did you mean 'SSL_F_CLIENT_HELLO'?
 2038 |         return SSL_CLIENT_HELLO_RETRY;
      |                ^~~~~~~~~~~~~~~~~~~~~~
      |                SSL_F_CLIENT_HELLO

Fixes:
 - http://autobuild.buildroot.org/results/d7d49cfce6f99c59e99c8e15399164fd5ecacc21

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit ac64086ce5f299b146c670ad4f3b63a163335ee2)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/uacme/Config.in

@@ -21,6 +21,8 @@ config BR2_PACKAGE_UACME_UALPN
 	bool "enable ualpn"
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_LIBEV
+	select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL \
+		if !(BR2_PACKAGE_GNUTLS || BR2_PACKAGE_MBEDTLS)
 	help
 	  Build and install ualpn, the transparent proxying tls-alpn-01
 	  challenge responder.