Use DBD_MARIADB_REQUIREEMBSUP=1 on Github Actions CI for client-version=system-pic parametrization

This ensures that the Makefile.PL will correctly use libmysqld library with
embedded server support for compiling DBD-MariaDB. If the libmysqld library
cannot be used then the Makefile.PL will return an error and build fails.

Author: pali

.github/workflows/ci.yaml

@@ -498,6 +498,7 @@ jobs:
             export DBD_MARIADB_CONFIG="$HOME/mysql_config"
           elif [ "${{ matrix.client-version }}" = "system-pic" ]; then
             export DBD_MARIADB_CONFIG="$HOME/mysql_config_pic"
+            export DBD_MARIADB_REQUIREEMBSUP=1
           fi
           make realclean || true
           perl Makefile.PL