package/zabbix: move Config.in comment to fix option indentation

The Config.in comment was before sub-options, so it was preventing
menuconfig from rendering sub-options indented under the main zabbix
option.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/zabbix/Config.in

@@ -10,9 +10,6 @@ config BR2_PACKAGE_ZABBIX
 
 	  https://zabbix.com
 
-comment "zabbix need glibc"
-	depends on !BR2_TOOLCHAIN_USES_GLIBC
-
 if BR2_PACKAGE_ZABBIX
 
 comment "zabbix server needs C++ and threads or wchar and dynamic libs"
@@ -81,3 +78,6 @@ comment "zabbix web UI requires PHP"
 endif
 
 endif
+
+comment "zabbix need glibc"
+	depends on !BR2_TOOLCHAIN_USES_GLIBC