whois: make it read /etc/whois.conf

Add CONFIG_FILE=/etc/whois.conf to makeFlags so whois actually reads
the system configuration file. Without this flag, /etc/whois.conf is
ignored.

Matches Debian and Arch Linux packaging.

Link: https://github.com/rfc1036/whois/blob/next/debian/rules
Link: https://gitlab.archlinux.org/archlinux/packaging/packages/whois/-/blob/main/PKGBUILD

Signed-off-by: Cryolitia PukNgae <Cryolitia@gmail.com>

pkgs/by-name/wh/whois/package.nix

@@ -50,7 +50,10 @@ stdenv.mkDerivation (finalAttrs: {
     done
   '';
 
-  makeFlags = [ "HAVE_ICONV=1" ];
+  makeFlags = [
+    "HAVE_ICONV=1"
+    "CONFIG_FILE=/etc/whois.conf"
+  ];
   buildFlags = [ "whois" ];
 
   installTargets = [ "install-whois" ];