Fixed some details on cross compilation. Among others:

- Stating better the guile dependencies (native/host) for guile to build
- Fixing cross-linking, through --rpath-link (ld(1) explains well about it
- Made gcc call the linker and the assembler through the gcc wrapper instead of
  directly. I thought this was the source of missing -rpath's, but the source
  of the problem ended up being the lack of --rpath-link. But I think the
  native gcc calls the wrapped ld and as, so let's do the same cross
  compiling.
- Removed the binutilsCross from the glibc expressions. Now they are built
  using the gcc-cross-wrapper, and they were built with the direct gcc and
  binutils before this change.
- I think patchelf and strip don't break the cross-compiled binaries, so I
  reallow them on cross compilation.
- I disable the checkPhase on cross compilation. This made gmp and libtool
  fail when cross compiled, iirc.


svn path=/nixpkgs/branches/stdenv-updates/; revision=18498

pkgs/development/libraries/gmp/default.nix

@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "1j5pklq36ivg2cim5wfysns229a544lqkimp3mlzkwjl513ra0ma";
   };
 
-  buildInputs = [m4];
+  buildNativeInputs = [m4];
 
   preConfigure = "ln -sf configfsf.guess config.guess";