Add PS4 port.

Thanks to Eddie Edwards.
Merge branch 'master' into v2.1
Fix for -jdump docs.
Merge branch 'master' into v2.1
Fix recording of BC_VARG.
Fix frame depth display for bytecode dump in -jdump.
Merge branch 'master' into v2.1
Merge branch 'v2.1' into v2.1-agentzh
feature: applied John Marino's patch for compiling LuaJIT on DragonFlyBSD. thanks lhmwzy for #1.