Make fixes for OS-specific deps

Makefile

@@ -1,4 +1,3 @@
-DEPS = $(shell go list -f '{{range .TestImports}}{{.}} {{end}}' ./...)
 PACKAGES = $(shell go list ./...)
 VETARGS?=-asmdecl -atomic -bool -buildtags -copylocks -methods \
          -nilfunc -printf -rangeloops -shift -structtags -unsafeptr
@@ -22,11 +21,11 @@ cov:
 
 deps:
 	@echo "--> Installing build dependencies"
-	@go get -d -v ./... $(DEPS)
+	@bash --norc scripts/deps.sh -d -v
 
 updatedeps: deps
 	@echo "--> Updating build dependencies"
-	@go get -d -f -u ./... $(DEPS)
+	@bash --norc scripts/deps.sh -d -f -u
 
 test: deps
 	@./scripts/test.sh

scripts/deps.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# First get the OS-specific packages
+GOOS=windows go get $@ github.com/StackExchange/wmi
+GOOS=windows go get $@ github.com/shirou/w32
+
+# Get the rest of the deps
+DEPS=$(go list -f '{{range .TestImports}}{{.}} {{end}}' ./...)
+go get $@ ./... $DEPS