tests/tcg: include CONFIG_PLUGIN in config-host.mak

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20221013131304.623740-1-pbonzini@redhat.com>
Message-Id: <20221027183637.2772968-27-alex.bennee@linaro.org>

configure

@@ -2486,6 +2486,9 @@ echo "HOST_CC=$host_cc" >> $config_host_mak
 if test -n "$gdb_bin"; then
     echo "HAVE_GDB_BIN=$gdb_bin" >> $config_host_mak
 fi
+if test "$plugins" = "yes" ; then
+    echo "CONFIG_PLUGIN=y" >> $config_host_mak
+fi
 
 tcg_tests_targets=
 for target in $target_list; do