binutils and cctools: Prefix derivation names with target for cross

We want platform triple prefixes and suffixes on derivation names to
be used consistently. The ideom this commit strives for is

 - suffix means build != host, i.e. cross *built* packages. This is
   already done.

 - prefix means build != target, i.e. cross tools. This matches the
   tradition of such binaries themselves being prefixed to disambiguate.]
   Binutils and cctools, as build tools, now use the latter

pkgs/development/tools/misc/binutils/default.nix

@@ -7,7 +7,7 @@ let basename = "binutils-2.28"; in
 let inherit (stdenv.lib) optional optionals optionalString; in
 
 stdenv.mkDerivation rec {
-  name = basename + optionalString (cross != null) "-${cross.config}";
+  name = optionalString (cross != null) "${cross.config}-" + basename;
 
   src = fetchurl {
     url = "mirror://gnu/binutils/${basename}.tar.bz2";

pkgs/os-specific/darwin/binutils/default.nix

@@ -15,7 +15,7 @@ in
 
 # TODO loop over prefixed binaries too
 stdenv.mkDerivation {
-  name = "cctools-binutils-darwin";
+  name = "${prefix}cctools-binutils-darwin";
   buildCommand = ''
     mkdir -p $out/bin $out/include
 

pkgs/os-specific/darwin/cctools/port.nix

@@ -19,7 +19,7 @@ assert (!isDarwin hostPlatform.parsed) -> (maloader != null && xctoolchain != nu
 
 let
   baseParams = rec {
-    name = "cctools-port-${version}";
+    name = "${prefix}cctools-port-${version}";
     version = "895";
 
     src = fetchFromGitHub {