upgrade expat & lpeg

game/thirdparty/lpeg/re.lua

src/expat/expat.h

src/expat/expat_external.h

src/expat/macconfig.h

src/expat/xmlparse.c

src/expat/xmlrole.c

src/expat/xmltok.c

src/expat/xmltok_impl.c

src/lpeg/lpeg.c

src/lpeg/lpeg.h

src/lxp/lxplib.c

src/lxp/lxplib.h

src/main.c