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crossdirect: fix 'could not find compiler "...-cc"' error

Administrator requested to merge crossdirect-fix into master 
cross/crossdirect: add more comments and license

Make it easier to wrap one's head around the code and make the license
explicit. It was implicit already by the LICENSE file of this repository.
cross/crossdirect: translate cc to gcc

Fix errors when trying to compile with "cc":
	ccache: error: Could not find compiler "aarch64-alpine-linux-musl-cc" in PATH

Test plan

  1. Reproduce the error when trying to cross compile packages from !1472 (merged) (which have CC=cc):
$ mrhlpr checkout 1472
$ pmbootstrap build --strict --arch=aarch64 sxmo-dwm
...
ccache: error: Could not find compiler "aarch64-alpine-linux-musl-cc" in PATH
  1. Verify that this MR fixes it
$ mrhlpr checkout # this MR
$ pmbootstrap build --strict crossdirect
$ mrhlpr checkout 1472
$ pmbootstrap build --strict --arch=aarch64 sxmo-dwm
(build finishes without error)

Fixes #732 (closed) and unblocks !1472 (merged).

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