sys/test: add more tests

Add syz_errno syscall which sets errno to the argument,
and add a test with different errno values.
This mostly tests the testing infrastructure itself.

Add syz_compare syscall which compare two blobs,
this can be used for testing of argument memory layout.

Implement syz_mmap and fix Makefile to allow building syz-execprog for test OS.
Useful for debugging.

Update #603

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