update luajit-2.0
update luajit-2.0

* submodules/luajit-2.0 ca5bbdf...1e67a4c (14):
  > ARM64: Fix math.floor/math.ceil for string args.
  > DynASM/PPC: Add sub/shift/rotate/clear instruction aliases.
  > DynASM/PPC: Add support for parameterized shifts/masks.
  > PPC: Fix cross-endian builds.
  > PPC: Fix write barrier in BC_TSETR.
  > Merge branch 'master' into v2.1
  > PPC64: Add build infrastructure.
  > Merge branch 'master' into v2.1
  > Merge branch 'master' into v2.1
  > Merge branch 'master' into v2.1
  > Merge branch 'master' into v2.1
  > Merge branch 'master' into v2.1
  > Merge branch 'master' into v2.1
  > LJ_FR2: Fix bytecode generation for method lookups.

vezril/ivs,floodlight/ivs,vezril/ivs,floodlight/ivs,vezril/ivs,floodlight/ivs