znc: enable features/support explicitly

Don't let znc autodetect library presence to avoid random missing
dependencies popping up.

Closes #2193.

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

net/znc/Makefile

@@ -277,8 +277,18 @@ CONFIGURE_VARS += \
 	LIBS="-lstdc++ -lm -lssl -lcrypto $(LIBGCC_S) -lc"
 
 CONFIGURE_ARGS += \
-	--disable-c-ares \
-	--disable-perl
+	--disable-charset \
+	--disable-cyrus \
+	--disable-debug \
+	--enable-largefile \
+	--disable-perl \
+	--enable-poll \
+	--disable-python \
+	--enable-ssl \
+	--disable-swig \
+	--disable-tcl \
+	--enable-tdns \
+	--enable-zlib
 
 define Build/Configure
 	$(call Build/Configure/Default,)