yasm: fix cross build

Yasm needs a compiler for the build host available for building the
internal 'genperf' tool.

This fixes cross-compiling yasm. Tested by compiling yasm for
aarch64 on x86_64.

pkgs/development/compilers/yasm/default.nix

@@ -1,4 +1,4 @@
-{lib, stdenv, fetchurl}:
+{lib, stdenv, fetchurl, buildPackages}:
 
 stdenv.mkDerivation rec {
   pname = "yasm";
@@ -9,6 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "0gv0slmm0qpq91za3v2v9glff3il594x5xsrbgab7xcmnh0ndkix";
   };
 
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+
   meta = with lib; {
     homepage = "http://www.tortall.net/projects/yasm/";
     description = "Complete rewrite of the NASM assembler";