nginx: make depencies more stricter

This should fix isse #54. It should no not be possible to select an
nginx subpackage without the appropriate module.

Signed-off-by: Thomas Heil <heil@terminal-consulting.de>

net/nginx/Config.in

 	bool
 	prompt "Enable NAXSI module"
 	select PACKAGE_nginx-naxsi
+	default y
 	help
 		Enable support for NAXSI WAF.
 
 config NGINX_PROXYPROTOCOL
 	bool
-	prompt "Enable NAXSI proxyprotocol"
+	prompt "Enable HAProxy proxyprotocol"
 	select PACKAGE_nginx-proxyprotocol
+	default y
 	help
 		Enable support for NAXSI WAF.
 
 	bool
 	prompt "Enable Syslog module"
 	select PACKAGE_nginx-syslog
+	default y
 	help
 		Provides the ability log to a remote destination
 

net/nginx/Makefile

 define Package/nginx-naxsi
         MENU:=1
         $(call Package/nginx)
-        TITLE+= nginx-naxsi
-        DEPENDS:=nginx
+        TITLE:=nginx-naxsi
+        DEPENDS:=nginx @NGINX_NAXSI
 endef
 
 define Package/nginx-naxsi/description
 define Package/nginx-proxyprotocol
         MENU:=1
         $(call Package/nginx)
-        TITLE+= nginx-proxyprotocol
-        DEPENDS:=nginx
+        TITLE:=nginx 
+        DEPENDS:=nginx @NGINX_PROXYPROTOCOL
 endef
 
 define Package/nginx-proxyprotocol/description
 define Package/nginx-syslog
         MENU:=1
         $(call Package/nginx)
-        TITLE+= nginx-syslog
-        DEPENDS:=nginx
+        TITLE:=nginx-syslog
+        DEPENDS:=nginx @NGINX_SYSLOG
 endef
 
 define Package/nginx-syslog/description