crystal_1_0, crystal_1_1: fix build

pkgs/development/compilers/crystal/default.nix

@@ -2,6 +2,7 @@
 , callPackage
 , fetchFromGitHub
 , fetchurl
+, fetchpatch
 , lib
   # Dependencies
 , boehmgc
@@ -97,6 +98,16 @@ let
         inherit sha256;
       };
 
+      patches = lib.optionals (lib.versionOlder version "1.2.0") [
+        # add support for DWARF5 debuginfo, fixes builds on recent compilers
+        # the PR is 8 commits from 2019, so just fetch the whole thing
+        # and hope it doesn't change
+        (fetchpatch {
+          url = "https://github.com/crystal-lang/crystal/pull/11399.patch";
+          sha256 = "sha256-CjNpkQQ2UREADmlyLUt7zbhjXf0rTjFhNbFYLwJKkc8=";
+        })
+      ];
+
       outputs = [ "out" "lib" "bin" ];
 
       postPatch = ''