Release the {cgo,VM}-free Linux/Intel version.

	modified:   Makefile
	new file:   all_linux_test.go
	renamed:    all_test.go -> all_test_windows.go
	new file:   doc.go
	new file:   generate_linux.go
	new file:   generate_windows.go
	modified:   generator.go
	new file:   generator_windows.go
	modified:   internal/bin/bin_linux_386.go
	modified:   internal/bin/bin_linux_amd64.go
	modified:   main.c
	modified:   sqlite.go
	modified:   sqlite_go18.go
	new file:   sqlite_windows.go

1 files changed, 2 insertions, 1 deletions

diff --git a/sqlite_go18.go b/sqlite_go18.go
index 4338dcc..b8c24ec 100644
--- a/sqlite_go18.go
+++ b/sqlite_go18.go
@@ -10,6 +10,7 @@ import (
 	"context"
 	"database/sql/driver"
 	"errors"
+	"unsafe"
 )
 
 // Ping implements driver.Pinger
@@ -17,7 +18,7 @@ func (c *conn) Ping(ctx context.Context) error {
 	c.Lock()
 	defer c.Unlock()
 
-	if c.ppdb == 0 {
+	if uintptr(unsafe.Pointer(c.ppdb)) == 0 {
 		return errors.New("db is closed")
 	}