build error on windows

[54huige]

github.com/afitz/golua/lua51

In file included from _cgo_export.c:4:
cgo-gcc-export-header-prolog:32:38: error: conflicting types for 'GoInterface'
In file included from lua.go:4,
from _cgo_export.c:4:
G:\����֪ʶѧϰ\golang\pkg\mod\github.com\afitz\golua@v0.0.0-20200927015923-1547954d871f\lua51/golua.h:2:38: note: previous declaration of 'GoInterface' was here
typedef struct { void *t; void *v; } GoInterface;