Removed make_commands attribute and fixed configure_make

[UebelAndre]

Attributes which encourage users to write raw bash are generally non-hermetic and lead to a bunch of difficult edge cases to account for. The targets attribute is far more desirable since it allows the rules to provide stable and consistent APIs across all the rules.

Additionally, this change fixes an inconsistency with configure_make where the targets API was not being used.
closes #670

[UebelAndre]

I think as part of this change I should also add an example of how to have a custom make binary to replace, what seems like, a common pattern where users use make_commands to prefix or change the tool being used based on the host's configuration. This is definitely not recommended but we should find a recommended approach.

This comment describes such an approach but I'm not sure if it encompasses enough of the functionality.

[UebelAndre]

I think as part of this change I should also add an example of how to have a custom make binary to replace, what seems like, a common pattern where users use make_commands to prefix or change the tool being used based on the host's configuration. This is definitely not recommended but we should find a recommended approach.

This comment describes such an approach but I'm not sure if it encompasses enough of the functionality.

I think #676 would solve for this in a way that makes transitioning easier since it doesn't require users to setup a toolchain

[UebelAndre]

This PR is blocked until #676 is resolved

[attilaolah]

Cool, this is unblocked now!

By the way, once this gets merged, and now that #676 is merged too, it would be really handy to have a new release :)

[UebelAndre]

@attilaolah This one is ready for review. Let me know if it solves the last issue you're having.

[attilaolah]

I'll probably have some timet o take a look at this later today. Running some build tests now to make sure that I have a clean/passing build before patching in this one.

[attilaolah]

OK I patched in this change, and all my builds still pass, and the targets and angs are both working as expected with configure_make(). I think this is good to go!