sysutils/tree: provide fallback download URL and other improvements
7fbb727e11be
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sysutils/tree: provide fallback download URL and other improvements

For some reason, upstream distfile site is currently inaccessible in certain parts of the world, e.g. Russia
Pass build-related variables down to inner Makefile via MAKE_ARGS and remove the patch file (particularly, it was patching `install' target which is useless as the port is using its own)
Adjust LICENSE (it's GPLv2 or later) and install documentation in the dedicated helper target (also install TODO file while here)