uclibc: Provide a more stable location for source.

At the upstream URL at http://git.uclibc.org/uClibc/snapshot/, older
versions are dropped at a regular basis. Unfortunately the tarball
"uClibc-20150131.tar.bz2" has already been deleted from that directory
and I didn't find a mirror providing the same file.

So I've switched it to use fetchzip from the cgit site instead of using
fetchgit directly. The reason why I didn't use fetchgit is that we'd
need need git, which depends (indirectly? not sure, haven't checked) on
libiconv and that in turn triggers an assertion if we're on Linux and
are cross-building using uclibc.

Signed-off-by: aszlig <[e-mail]>

pkgs/os-specific/linux/uclibc/default.nix

···
-{stdenv, fetchurl, linuxHeaders, libiconvReal, cross ? null, gccCross ? null,
+{stdenv, fetchzip, linuxHeaders, libiconvReal, cross ? null, gccCross ? null,
 extraConfig ? ""}:
 
 assert stdenv.isLinux;
···
     UCLIBC_HAS_FPU n
   '';
 
+  name = "uclibc-0.9.34-pre-20150131";
+  rev = "343f6b8f1f754e397632b0552e4afe586c8b392b";
+
 in
 
 stdenv.mkDerivation {
-  name = "uclibc-0.9.34-pre-20150131" + stdenv.lib.optionalString (cross != null)
-    ("-" + cross.config);
+  name = name + stdenv.lib.optionalString (cross != null) ("-" + cross.config);
 
-  src = fetchurl {
-    url = http://www.uclibc.org/downloads/snapshots/uClibc-20150131.tar.bz2;
-    sha256 = "14svyxw4nizdcz4vqk9nizlgy32d8ngpvcca34jjbdjjg77xdvkc";
+  src = fetchzip {
+    name = name + "-source";
+    url = "http://git.uclibc.org/uClibc/snapshot/uClibc-${rev}.tar.bz2";
+    sha256 = "1kgylzpid7da5i7wz7slh5q9rnq1m8bv5h9ilm76g0xwc2iwlhbw";
   };
 
   # 'ftw' needed to build acl, a coreutils dependency

pkgs/top-level/all-packages.nix

···
   uclibc = callPackage ../os-specific/linux/uclibc { };
 
   uclibcCross = lowPrio (callPackage ../os-specific/linux/uclibc {
-    inherit fetchurl stdenv libiconvReal;
+    inherit fetchzip stdenv libiconvReal;
     linuxHeaders = linuxHeadersCross;
     gccCross = gccCrossStageStatic;
     cross = assert crossSystem != null; crossSystem;