fossil: fix cross

Co-authored-by: Artturi <[e-mail]>

pkgs/applications/version-management/fossil/default.nix

···
 , tcl
 , libiconv
 , fetchurl
+, buildPackages
 , zlib
 , openssl
 , readline
···
     url = "https://www.fossil-scm.org/home/tarball/version-${version}/fossil-${version}.tar.gz";
     sha256 = "1knff50rr8f39myxj50fprb9ya87cslmwz7zzfya56l33r7i7jh3";
   };
+
+  # required for build time tool `./tools/translate.c`
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
 
   nativeBuildInputs = [ installShellFiles tcl tcllib ];