qLibc 2.4.1 Release

Hi all the qLibc developers

I'm pleased to announce qLib 2.4.1 Release.
This is a minor release that fixes some of minor issues found from the last major release.

Changes

• Fix hashtbl double free issue in thread_safe mode.
• Fix missing qtokenbucket.h header.
• Build system enhancements.

Merry Christmas & Happy New Year 2016!
Thank you all

Seungyoung "Steve" Kim