package/libressl: disable tests

Disable tests to avoid the following build failure since bump to version
3.5.2 in commit 8b216927db080b38fdbf1f8b025b6f90a89d4bc2:

In file included from /nvmedata/autobuild/instance-11/output-1/host/aarch64_be-buildroot-linux-uclibc/sysroot/usr/include/stdio.h:71,
                 from /nvmedata/autobuild/instance-11/output-1/build/libressl-3.5.2/tests/../include/compat/stdio.h:18,
                 from /nvmedata/autobuild/instance-11/output-1/build/libressl-3.5.2/tests/rfc3779.c:18:
/nvmedata/autobuild/instance-11/output-1/host/aarch64_be-buildroot-linux-uclibc/sysroot/usr/include/bits/uClibc_stdio.h:149:23: error: expected identifier or '(' before ';' token
  149 |         void *__unused;                         /* Placeholder for codeset binding. */
      |                       ^

Fixes:
 - http://autobuild.buildroot.org/results/620cb8d542c2e0c263233f5b746cbc9be1bd9547

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libressl/libressl.mk

@@ -10,7 +10,7 @@ LIBRESSL_LICENSE = ISC (new additions), OpenSSL or SSLeay (original OpenSSL code
 LIBRESSL_LICENSE_FILES = COPYING
 LIBRESSL_CPE_ID_VENDOR = openbsd
 LIBRESSL_INSTALL_STAGING = YES
-LIBRESSL_CONF_OPTS = -DOPENSSLDIR="/etc/ssl"
+LIBRESSL_CONF_OPTS = -DLIBRESSL_TESTS=OFF -DOPENSSLDIR="/etc/ssl"
 
 ifeq ($(BR2_PACKAGE_LIBRESSL_BIN),)
 define LIBRESSL_REMOVE_BIN