ip2unix: 2.1.2 -> 2.1.3

Upstream fixes:

  - Pass linker version script to the linker instead of the compiler.
  - Compile with `-fPIC` again (regression from version 2.1.2).
  - Out of bounds array access in `globpath`.
  - Handling of `epoll_ctl` calls (they're now replayed after replacing
    socket).
  - GCC 10 build errors and Clang warnings.

While most of these fixes are more relevant for other distros, the
linker script fix is actually a regression existing since a long time
(version 1.x) and caused libip2unix to expose way too many symbols.

Built and tested on i686-linux and x86_64-linux.

Signed-off-by: aszlig <aszlig@nix.build>
(cherry picked from commit 67325b1)

pkgs/tools/networking/ip2unix/default.nix

@@ -5,13 +5,13 @@
 
 stdenv.mkDerivation rec {
   pname = "ip2unix";
-  version = "2.1.2";
+  version = "2.1.3";
 
   src = fetchFromGitHub {
     owner = "nixcloud";
     repo = "ip2unix";
     rev = "v${version}";
-    sha256 = "1ci0k3zy3hjkg65ah5h75mfvrd578xf2z1449xmgjm3iz3d6kqs2";
+    sha256 = "19c449h60b2m1d8kawnhpi4y9y4ddm24jmlh8kilqmx8m5l2khr6";
   };
 
   nativeBuildInputs = [