treewide: remove platform assertions

linux: readd assertion

pkgs/tools/networking/ssmtp/default.nix

@@ -4,7 +4,7 @@ assert tlsSupport -> openssl != null;
 
 stdenv.mkDerivation {
   name = "ssmtp-2.64";
-  
+
   src = fetchurl {
     url = mirror://debian/pool/main/s/ssmtp/ssmtp_2.64.orig.tar.bz2;
     sha256 = "0dps8s87ag4g3jr6dk88hs9zl46h3790marc5c2qw7l71k4pvhr2";
@@ -28,7 +28,7 @@ stdenv.mkDerivation {
   installFlags = "etcdir=$(out)/etc";
 
   installTargets = [ "install" "install-sendmail" ];
-  
+
   buildInputs = stdenv.lib.optional tlsSupport openssl;
 
   meta = with stdenv.lib; {