Fix missing vendor dir

vendor/github.com/shirou/gopsutil/mem/mem_openbsd_amd64.go

@@ -0,0 +1,32 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_openbsd.go
+
+package mem
+
+const (
+	CTLVfs        = 10
+	VfsGeneric    = 0
+	VfsBcacheStat = 3
+)
+
+const (
+	sizeOfBcachestats = 0x78
+)
+
+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
+}