[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/stat_linux.go

@@ -0,0 +1,40 @@
+//go:build (amd64 || arm64 || riscv64) && linux
+
+// Note: This expression is not the same as compiler support, even if it looks
+// similar. Platform functions here are used in interpreter mode as well.
+
+package sysfs
+
+import (
+	"io/fs"
+	"os"
+
+	experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
+	"github.com/tetratelabs/wazero/sys"
+)
+
+// dirNlinkIncludesDot is true because even though os.File filters out dot
+// entries, the underlying syscall.Stat includes them.
+//
+// Note: this is only used in tests
+const dirNlinkIncludesDot = true
+
+func lstat(path string) (sys.Stat_t, experimentalsys.Errno) {
+	if info, err := os.Lstat(path); err != nil {
+		return sys.Stat_t{}, experimentalsys.UnwrapOSError(err)
+	} else {
+		return sys.NewStat_t(info), 0
+	}
+}
+
+func stat(path string) (sys.Stat_t, experimentalsys.Errno) {
+	if info, err := os.Stat(path); err != nil {
+		return sys.Stat_t{}, experimentalsys.UnwrapOSError(err)
+	} else {
+		return sys.NewStat_t(info), 0
+	}
+}
+
+func statFile(f fs.File) (sys.Stat_t, experimentalsys.Errno) {
+	return defaultStatFile(f)
+}