lib/licenses: mark watcom as non‐Free

Although this license is approved by the OSI, Fedora, Debian, and
the FSF all consider it non‐Free due to an onerous use restriction
that requires publication of even privately‐deployed modifications
(failing the “desert island test” and the “dissident test”).

See: <https://en.wikipedia.org/wiki/Sybase_Open_Watcom_Public_License>

lib/licenses.nix

@@ -1290,6 +1290,8 @@ lib.mapAttrs mkLicense ({
   watcom = {
     spdxId = "Watcom-1.0";
     fullName = "Sybase Open Watcom Public License 1.0";
+    free = false;
+    redistributable = true;
   };
 
   w3c = {