package/zabbix: add missing BR2_OPTIMIZE_FAST

Add missing BR2_OPTIMIZE_FAST dependency to BR2_PACKAGE_ZABBIX_SERVER
to avoid the following build failure raised since commit
e702a05d8998a1f2416225eb62b43b6585738fe9:

checking for Zabbix server/proxy database selection... error
configure: error: No database selected for Zabbix server/proxy. Use --with-mysql or --with-oracle or --with-postgresql or --with-sqlite3.

Fixes:
 - http://autobuild.buildroot.org/results/ab403b45761c82f49a9380564bf10d3e7ae935f2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 6da2b51a66a848cc9a7346302227fd4740fc7e67)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/zabbix/Config.in

@@ -26,7 +26,7 @@ config BR2_PACKAGE_ZABBIX_SERVER
 	depends on BR2_USE_MMU # mysql, postgresql
 	depends on \
 		(BR2_INSTALL_LIBSTDCPP && BR2_TOOLCHAIN_HAS_THREADS) || \
-		(BR2_USE_WCHAR && !BR2_STATIC_LIBS)
+		(BR2_USE_WCHAR && !BR2_STATIC_LIBS && !BR2_OPTIMIZE_FAST)
 	select BR2_PACKAGE_ZLIB
 	select BR2_PACKAGE_LIBEVENT