build failure on macOS

[tgross]

Following the merge of #7347, builds fail on macOS because of missing vendored cgo dependencies in the upstream gopsutil library: shirou/gopsutil#832.

▶ make dev
--> Formatting vendor/vendor.json
test -x /Users/tim/go/bin/vendorfmt || go get -u github.com/magiconair/vendorfmt/cmd/vendorfmt
vendorfmt
Formatted vendor/vendor.json
--> Making [GH-xxxx] references clickable...
--> Formatting HCL
==> Removing old development build...
==> Building pkg/darwin_amd64/nomad with tags ui ...
# github.com/hashicorp/nomad/vendor/github.com/shirou/gopsutil/host
vendor/github.com/shirou/gopsutil/host/host_darwin_cgo.go:9:11: fatal error: 'include/smc.c' file not found
 #include "include/smc.c"
          ^~~~~~~~~~~~~~~
1 error generated.
make[1]: *** [pkg/darwin_amd64/nomad] Error 2
make: *** [dev] Error 2

@notnoop we can hack around this until we can get it patched in upstream by vendoring in the contents of https://github.com/shirou/gopsutil/tree/master/host/include directly, but I suspect that's going to make govendor's checksumming unhappy?

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