lang/mujs: Update 1.0.5-10 -> 1.0.5-21

Port changes:

• Add the pull request patch enabling readline in FreeBSD
• WITH_DEBUG triggers build=debug - the project manages its build options itself
• Rm the post-install patch - the .pc issue has been fixed
• Add FreeBSD-related patches eliminating build warnings, build using -O3 instead of -Os