Update loadext.c
Update sqliteInt.h
Update select.c
Merge pull request #47 from 520060628/master

Update loadext.c
Merge pull request #48 from yujiesun/patch-2

Update sqliteInt.h
Merge pull request #49 from Ameliamin/master

Update select.c
Merge pull request #24 from HuiLi/master

合并更新