cgo shows expected ‘const char **’ but argument is of type ‘char **’

What steps will reproduce the problem?
1.go get -x github.com/mattn/go-sqlite3

What is the expected output?
remove such warning

What do you see instead?
gcc -I . -g -O2 -fPIC -m64 -pthread -I $WORK/github.com/mattn/go-sqlite3/_obj/ -o
$WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.cgo2.o -c
$WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.cgo2.c

# github.com/mattn/go-sqlite3
sqlite3.go: In function ‘_cgo_fe2086fd4234_Cfunc_sqlite3_prepare_v2’:
sqlite3.go:324 warning: passing argument 5 of ‘sqlite3_prepare_v2’ from incompatible
pointer type [enabled by default]
/usr/include/sqlite3.h:2924:16: note: expected ‘const char **’ but argument is of
type ‘char **’

Which compiler are you using (5g, 6g, 8g, gccgo)?
go

Which operating system are you using?
ArchLinux x86_64

Which revision are you using?  (hg identify)
go-hg version 1c2e5d6d7660
sqlite3 3.7.10-1
gcc (GCC) 4.6.2 20120120 (prerelease)

Please provide any additional information below.

mattn/go-sqlite3#8
As comment said, it occurs between Go version 9e53309dfa6d and 1c2e5d6d7660.