Allow make dev to build only one component

[dlsniper]

Hi, while working on #3062 I've realized that I'm spending about 1.5 minutes to build all the Terraform components. Would there be any issues into having an option to build a certain component?
What I have in mind is something like make dev provider-aws.

Thank you.

[apparentlymart]

I've been doing this with the following rather-awkward construction:

go install github.com/hashicorp/terraform/builtin/bins/provider-aws && mv $GOPATH/bin/provider-aws $GOPATH/bin/terraform-provider-aws

Many moons ago I looked at making something like make dev PLUGINS="provider-aws provider-rundeck" but got stuck down a rathole learning about how gox works. However, maybe it would be simpler to just change scripts/build.sh to look for the PLUGINS variable and just run something like what I quoted above instead of using gox at all, since gox isn't really important when you're only building for the host architecture anyway.

[apparentlymart]

In 3af5552 I added a way to do this, slightly different to what we discussed before:

make plugin-dev PLUGIN=provider-aws

Rather than complicating the existing dev and quickdev targets further, I just made a separate target that just runs basically the thing I mentioned in my earlier comment. There's no advantage to using gox when building a single package for just the host architecture.

[ghost]

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