Fix missing vendor dir

vendor/github.com/shirou/gopsutil/mem/mem_openbsd_arm64.go

@@ -0,0 +1,37 @@
+// +build openbsd,arm64
+
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs mem/types_openbsd.go
+
+package mem
+
+const (
+	CTLVfs        = 10
+	VfsGeneric    = 0
+	VfsBcacheStat = 3
+)
+
+const (
+	sizeOfBcachestats = 0x90
+)
+
+type Bcachestats struct {
+	Numbufs       int64
+	Numbufpages   int64
+	Numdirtypages int64
+	Numcleanpages int64
+	Pendingwrites int64
+	Pendingreads  int64
+	Numwrites     int64
+	Numreads      int64
+	Cachehits     int64
+	Busymapped    int64
+	Dmapages      int64
+	Highpages     int64
+	Delwribufs    int64
+	Kvaslots      int64
+	Avail         int64
+	Highflips     int64
+	Highflops     int64
+	Dmaflips      int64
+}