nix & build housekeeping, alternative D compilers

- compilation status
  - dmd (@D2.100) ok, & has been fine
  - ldc (@D2.100) ok, & has been fine
  - gdc11 available in nixpkgs does not compile
    awaiting gdc12 (which would also be based on
    @D2.100 & just might)

1 files changed, 4 insertions, 0 deletions

diff --git a/dub.json b/dub.json
index 801e119..530a9fe 100644
--- a/dub.json
+++ b/dub.json
@@ -119,6 +119,10 @@
     {
       "name":                  "gdc",
       "targetName":            "spine-gdc"
+    },
+    {
+      "name":                  "gdmd",
+      "targetName":            "spine-gdc"
     }
   ]
 }