[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/sock_unix.go

@@ -0,0 +1,49 @@
+//go:build (linux || darwin) && !tinygo
+
+package sysfs
+
+import (
+	"net"
+	"syscall"
+
+	"github.com/tetratelabs/wazero/experimental/sys"
+	"github.com/tetratelabs/wazero/internal/fsapi"
+	socketapi "github.com/tetratelabs/wazero/internal/sock"
+)
+
+// MSG_PEEK is the constant syscall.MSG_PEEK
+const MSG_PEEK = syscall.MSG_PEEK
+
+func newTCPListenerFile(tl *net.TCPListener) socketapi.TCPSock {
+	return newDefaultTCPListenerFile(tl)
+}
+
+func _pollSock(conn syscall.Conn, flag fsapi.Pflag, timeoutMillis int32) (bool, sys.Errno) {
+	n, errno := syscallConnControl(conn, func(fd uintptr) (int, sys.Errno) {
+		if ready, errno := poll(fd, fsapi.POLLIN, 0); !ready || errno != 0 {
+			return -1, errno
+		} else {
+			return 0, errno
+		}
+	})
+	return n >= 0, errno
+}
+
+func setNonblockSocket(fd uintptr, enabled bool) sys.Errno {
+	return sys.UnwrapOSError(setNonblock(fd, enabled))
+}
+
+func readSocket(fd uintptr, buf []byte) (int, sys.Errno) {
+	n, err := syscall.Read(int(fd), buf)
+	return n, sys.UnwrapOSError(err)
+}
+
+func writeSocket(fd uintptr, buf []byte) (int, sys.Errno) {
+	n, err := syscall.Write(int(fd), buf)
+	return n, sys.UnwrapOSError(err)
+}
+
+func recvfrom(fd uintptr, buf []byte, flags int32) (n int, errno sys.Errno) {
+	n, _, err := syscall.Recvfrom(int(fd), buf, int(flags))
+	return n, sys.UnwrapOSError(err)
+}