package/mariadb: fix build with libressl

Fix the following build failure with libressl:

CMake Error: TRY_RUN() invoked in cross-compiling mode, please set the following cache variables appropriately:
   LIBRESSL_RESULT (advanced)
   LIBRESSL_RESULT__TRYRUN_OUTPUT (advanced)
For details see /nvmedata/autobuild/instance-27/output-1/build/mariadb-10.3.34/TryRunResults.cmake

Fixes:
 - http://autobuild.buildroot.org/results/cbdbfcdae4b89ac678e1bf6bcded96872c7223ab

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 174808651947428e68fd5380c8968ce26bb297d5)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mariadb/mariadb.mk

@@ -60,6 +60,12 @@ MARIADB_CONF_OPTS += -DCMAKE_CROSSCOMPILING=1
 # Explicitly disable dtrace to avoid detection of a host version
 MARIADB_CONF_OPTS += -DENABLE_DTRACE=0
 
+ifeq ($(BR2_PACKAGE_LIBRESSL),y)
+MARIADB_CONF_OPTS += \
+	-DLIBRESSL_RESULT=ON \
+	-DLIBRESSL_RESULT__TRYRUN_OUTPUT="LibreSSL $(LIBRESSL_VERSION)"
+endif
+
 ifeq ($(BR2_PACKAGE_MARIADB_SERVER),y)
 ifeq ($(BR2_PACKAGE_MARIADB_SERVER_EMBEDDED),y)
 MARIADB_CONF_OPTS += -DWITH_EMBEDDED_SERVER=ON