FIX: Rebuild multiarc.ini (fixes #1568)

src/uglobs.pas

@@ -1570,7 +1570,7 @@ begin
     CopyFile(gpExePath + 'default' + PathDelim + 'pixmaps.txt', gpCfgDir + 'pixmaps.txt');
   end;
   // multiarc configuration file
-  if not mbFileExists(gpCfgDir + sMULTIARC_FILENAME) then
+  if (mbFileSize(gpCfgDir + sMULTIARC_FILENAME) = 0) then
   begin
     CopyFile(gpExePath + 'default' + PathDelim + sMULTIARC_FILENAME, gpCfgDir + sMULTIARC_FILENAME);
   end;

src/umultiarc.pas

@@ -325,7 +325,13 @@ begin
       end;
       FList.AddObject(Section, MultiArcItem);
     end;
-    if FirstTime then AutoConfigure;
+    if FirstTime then
+    try
+      AutoConfigure;
+      SaveToFile(FileName);
+    except
+      // Ignore
+    end;
   finally
     FreeAndNil(IniFile);
     FreeAndNil(Sections);