znc: drop GCC dependencies

OpenWrt trunk's lowest supported GCC version is 4.8, so we don't need
to depend on specific versions anymore. Fixes visibility with GCC 5,
the current default.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

net/znc/Makefile

@@ -34,7 +34,7 @@ endef
 
 define Package/znc
   $(Package/znc/default)
-  DEPENDS:=+libopenssl +libpthread +libstdcpp @GCC_VERSION_4_8||GCC_VERSION_4_9
+  DEPENDS:=+libopenssl +libpthread +libstdcpp
   MENU:=1
 endef