programs: ship cdecl

hosts/common/programs/assorted.nix

@@ -140,6 +140,7 @@ in
     consoleUtils = declPackageSet [
       "alsa-utils"  # for aplay, speaker-test
       "bc"  # CLI calculator
+      "cdecl"  # like <https://cdecl.org>. `cdecl explain 'struct foo *const inst'`
       # "cdrtools"
       # "clinfo"
       # "dmidecode"
@@ -476,6 +477,8 @@ in
 
     "cacert.unbundled".sandbox.enable = false;  #< data only
 
+    cdecl = {};
+
     clang = {};
 
     clang-tools.sandbox.whitelistPwd = true;