Fix compilation issues in QEMU machine files (Windows platform)

Signed-off-by: Arthur Sengileyev <arthur.sengileyev@gmail.com>

pkg/machine/qemu/command/command_unix.go

@@ -0,0 +1,18 @@
+//go:build dragonfly || freebsd || linux || netbsd || openbsd
+
+package command
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/containers/common/pkg/strongunits"
+)
+
+// SetMemory adds the specified amount of memory for the machine
+func (q *QemuCmd) SetMemory(m strongunits.MiB) {
+	serializedMem := strconv.FormatUint(uint64(m), 10)
+	// In order to use virtiofsd, we must enable shared memory
+	*q = append(*q, "-object", fmt.Sprintf("memory-backend-memfd,id=mem,size=%sM,share=on", serializedMem))
+	*q = append(*q, "-m", serializedMem)
+}