pkg-config and --static flag

[PlayerWithoutName]

On linux, this project fails to build because of --static flag not being parsed by cgo, this is connected to this issue: golang/go#12058

Don't know about Windowsbeing affected, too. I'll prepare a pull request with fix in a few minutes.

[PlayerWithoutName]

Also, here is the go build output:

go build github.com/vulkan-go/vulkan: invalid pkg-config package name: --static