[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.go

@@ -0,0 +1,37 @@
+//go:build (linux || darwin) && !tinygo
+
+package sysfs
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/tetratelabs/wazero/experimental/sys"
+)
+
+func timesToPtr(times *[2]syscall.Timespec) unsafe.Pointer { //nolint:unused
+	if times != nil {
+		return unsafe.Pointer(&times[0])
+	}
+	return unsafe.Pointer(nil)
+}
+
+func timesToTimespecs(atim int64, mtim int64) (times *[2]syscall.Timespec) {
+	// When both inputs are omitted, there is nothing to change.
+	if atim == sys.UTIME_OMIT && mtim == sys.UTIME_OMIT {
+		return
+	}
+
+	times = &[2]syscall.Timespec{}
+	if atim == sys.UTIME_OMIT {
+		times[0] = syscall.Timespec{Nsec: _UTIME_OMIT}
+		times[1] = syscall.NsecToTimespec(mtim)
+	} else if mtim == sys.UTIME_OMIT {
+		times[0] = syscall.NsecToTimespec(atim)
+		times[1] = syscall.Timespec{Nsec: _UTIME_OMIT}
+	} else {
+		times[0] = syscall.NsecToTimespec(atim)
+		times[1] = syscall.NsecToTimespec(mtim)
+	}
+	return
+}