Make the code compile with LLVM and on MacOS

TJAlienCredentials.cxx

@@ -142,6 +142,8 @@ bool TJAlienCredentials::has(CredentialsKind kind) {
 TJAlienCredentialsObject TJAlienCredentials::get(CredentialsKind kind) {
     if(this->has(kind)) {
         return found_credentials[kind];
+    } else {
+      return TJAlienCredentialsObject();
     }
 }
 

TJAlienDNSResolver.h

@@ -16,7 +16,7 @@
 using std::string;
 using std::vector;
 
-class TJAlienDNSResolver : TObject {
+class TJAlienDNSResolver : public TObject {
  public:
     TJAlienDNSResolver(string host, int port);
     string get_next_host();

TJClientFile.cxx

@@ -23,8 +23,8 @@ TString TJClientFile::getDefaultPath() {
   sprintf(jclientFileLocation, "%s%s%s", P_tmpdir, "/jclient_token_", cUserId);
   defaultJClientPath = TString(jclientFileLocation);
 
-  delete cUserId;
-  delete jclientFileLocation;
+  delete[] cUserId;
+  delete[] jclientFileLocation;
 
   return defaultJClientPath;
 }