semantic error: unable to find member 'strmask' for struct global_State

[billnote]

Environment:
OS: centos 7
OpenResty: version: 1.19.3.1; build: ./configure --with-debug --without-luajit-gc64

Error info:

# ./samples/lj-gc-objs.sxx -x 22086
Found exact match for libluajit: /usr/local/openresty/luajit/lib/libluajit-5.1.so.2.1.0
semantic error: while processing function luajit_objlen

semantic error: unable to find member 'strmask' for struct global_State (alternatives: hookmask, vmevmask, str, strempty, gc, jit_base, tmptv, wrapf, stremptyz, vmstate, hookf, panic, prng, tmpbuf, tmptv2, cur_L, gcroot, registrytv, uvhead, allocd, allocf, hookcstart, ctype_state, nilnode, mainthref, saved_jit_base, dispatchmode, hookcount, bc_cfunc_ext, bc_cfunc_int): operator '->' at stapxx-AieXDJJg/luajit.stp:62:106
        source: @define sizeof_ptr %( &@cast(0, "global_State", "/usr/local/openresty/luajit/lib/libluajit-5.1.so.2.1.0")->strmask %)
                                                                                                                         ^
	in expansion of macro: operator '@sizeof_ptr' at stapxx-AieXDJJg/luajit.stp:295:18
        source:             sz = @sizeof_ptr
                                 ^

[billnote]

The reason for this problem is that Luajit changed the structure of the global_State struct. This pr can fix this problem: #53