Makefile, sys/targets: move all native compilation logic to sys/targets

We currently have native cross-compilation logic duplicated
in Makefile and in sys/targets. Some pieces are missed in one
place, some are in another. Only pkg/csource knows how to check
for -static support.

Move all CC/CFLAGS logic to sys/targets and pull results in Makefile.

This should make Makefile work on distros that have broken x86_64-linux-gnu-gcc,
now we will use just gcc. And this removes the need to define NOSTATIC,
as it's always auto-detected.

This also paves the way for making pkg/csource work on OSes other than Linux.

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