sharutils: pull pending upstream fix for -fno-common compiler

Fixes build failure against upstream gcc (defaults -fno-common)

pkgs/tools/archivers/sharutils/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, gettext, coreutils }:
+{ lib, stdenv, fetchurl, fetchpatch, gettext, coreutils }:
 
 stdenv.mkDerivation rec {
   pname = "sharutils";
@@ -30,6 +30,19 @@ stdenv.mkDerivation rec {
       url = "https://sources.debian.org/data/main/s/sharutils/1:4.15.2-4/debian/patches/02-fix-ftbfs-with-glibc-2.28.patch";
       sha256 = "15kpjqnfs98n6irmkh8pw7masr08xala7gx024agv7zv14722vkc";
     })
+
+    # pending upstream build fix against -fno-common compilers like >=gcc-10
+    # Taken from https://lists.gnu.org/archive/html/bug-gnu-utils/2020-01/msg00002.html
+    (fetchpatch {
+      name = "sharutils-4.15.2-Fix-building-with-GCC-10.patch";
+      url = "https://lists.gnu.org/archive/html/bug-gnu-utils/2020-01/txtDL8i6V6mUU.txt";
+      sha256 = "0kfch1vm45lg237hr6fdv4b2lh5b1933k0fn8yj91gqm58svskvl";
+    })
+    (fetchpatch {
+      name = "sharutils-4.15.2-Do-not-include-lib-md5.c-into-src-shar.c.patch";
+      url = "https://lists.gnu.org/archive/html/bug-gnu-utils/2020-01/txt5Z_KZup0yN.txt";
+      sha256 = "0an8vfy3qj6sss9w0i4j8ilf7g5mbc7y13l644jy5bcm9przcjbd";
+    })
   ];
 
   postPatch = let