[experiment] add alternative wasm sqlite3 implementation available via build-tag (#2863)

This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).

vendor/github.com/tetratelabs/wazero/internal/sysfs/futimens_windows.go

@@ -0,0 +1,42 @@
+package sysfs
+
+import (
+	"syscall"
+
+	"github.com/tetratelabs/wazero/experimental/sys"
+)
+
+func utimens(path string, atim, mtim int64) sys.Errno {
+	return chtimes(path, atim, mtim)
+}
+
+func futimens(fd uintptr, atim, mtim int64) error {
+	// Per docs, zero isn't a valid timestamp as it cannot be differentiated
+	// from nil. In both cases, it is a marker like sys.UTIME_OMIT.
+	// See https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-setfiletime
+	a, w := timespecToFiletime(atim, mtim)
+
+	if a == nil && w == nil {
+		return nil // both omitted, so nothing to change
+	}
+
+	// Attempt to get the stat by handle, which works for normal files
+	h := syscall.Handle(fd)
+
+	// Note: This returns ERROR_ACCESS_DENIED when the input is a directory.
+	return syscall.SetFileTime(h, nil, a, w)
+}
+
+func timespecToFiletime(atim, mtim int64) (a, w *syscall.Filetime) {
+	a = timespecToFileTime(atim)
+	w = timespecToFileTime(mtim)
+	return
+}
+
+func timespecToFileTime(tim int64) *syscall.Filetime {
+	if tim == sys.UTIME_OMIT {
+		return nil
+	}
+	ft := syscall.NsecToFiletime(tim)
+	return &ft
+}