deps: Update LuaJIT to 2.0.4. #2688

Changes since 2.0.3:

 - Fix stack check in narrowing optimization.
 - Fix Lua/C API typecheck error for special indexes.
 - Fix string to number conversion.
 - Fix lexer error for chunks without tokens.
 - Don't compile IR_RETF after CALLT to ff with-side effects.
 - Fix BC_UCLO/BC_JMP join optimization in Lua parser.
 - Fix corner case in string to number conversion.
 - Gracefully handle lua_error() for a suspended coroutine.
 - Avoid error messages when building with Clang.
 - Fix snapshot #0 handling for traces with a stack check on entry.
 - Fix fused constant loads under high register pressure.
 - Invalidate backpropagation cache after DCE.
 - Fix ABC elimination.
 - Fix debug info for main chunk of stripped bytecode.
 - Fix FOLD rule for string.sub(s, ...) == k.
 - Fix FOLD rule for STRREF of SNEW.
 - Fix frame traversal while searching for error function.
 - Prevent GC estimate miscalculation due to buffer growth.
 - Prevent adding side traces for stack checks.
 - Fix top slot calculation for snapshots with continuations.
 - Fix check for reuse of SCEV results in FORL.
 - Add PS Vita port.
 - Fix compatibility issues with Illumos.
 - Fix DragonFly build (unsupported).
 - OpenBSD/x86: Better executable memory allocation for W^X mode.
 - x86: Fix argument checks for ipairs() iterator.
 - x86: lj_math_random_step() clobbers XMM regs on OSX Clang.
 - x86: Fix code generation for unused result of math.random().
 - x64: Allow building with LUAJIT_USE_SYSMALLOC and LUAJIT_USE_VALGRIND.
 - x86/x64: Fix argument check for bit shifts.
 - x86/x64: Fix code generation for fused test/arith ops.
 - ARM: Fix write barrier check in BC_USETS.
 - PPC: Fix red zone overflow in machine code generation.
 - PPC: Don't use mcrxr on PPE.
 - Various archs: Fix excess stack growth in interpreter.
 - FFI: Fix FOLD rule for TOBIT + CONV num.u32.
 - FFI: Prevent DSE across ffi.string().
 - FFI: No meta fallback when indexing pointer to incomplete struct.
 - FFI: Fix initialization of unions of subtypes.
 - FFI: Fix cdata vs. non-cdata arithmetic and comparisons.
 - FFI: Fix __index/__newindex metamethod resolution for ctypes.
 - FFI: Fix compilation of reference field access.
 - FFI: Fix frame traversal for backtraces with FFI callbacks.
 - FFI: Fix recording of indexing a struct pointer ctype object itself.
 - FFI: Allow non-scalar cdata to be compared for equality by address.
 - FFI: Fix pseudo type conversions for type punning.

Taken from http://luajit.org/changes.html

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