fix: use apt's default for doxygen on older ubuntu

Author: aminya

dist/setup_cpp.js

@@ -33,7 +33,7 @@ export function getVersion(name: string, version: string | undefined, osVersion:
             case "meson":
               return osVersion[0] === 18 ? "0.61.4" : "" /* pip default */
             case "doxygen":
-              return "1.9.1"
+              return "" /* apt default */
             default: {
               // nothing
             }

dist/setup_cpp.js.map

@@ -56,6 +56,9 @@ export async function setupDoxygen(version: string, setupDir: string, arch: stri
     }
     case "linux": {
       let installationInfo: InstallationInfo
+      if (version === "") {
+        installationInfo = setupAptPack("doxygen", undefined)
+      }
       try {
         // doxygen on stable Ubuntu repositories is very old. So, we use get the binary from the website itself
         installationInfo = await setupBin("doxygen", version, getDoxygenPackageInfo, setupDir, arch)