buildworld: Really support static toolchain.

Not to be used for day-to-day stuff, testing and experimenting feature only.
This includes the cross-tools and would come very helpful when we will make

buildworld: Really support static toolchain.

Not to be used for day-to-day stuff, testing and experimenting feature only.
This includes the cross-tools and would come very helpful when we will make
a switch for /libexec/ld-elf.so runtime linker.

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binutils227: Add build dirs.

It is unclear weather -Wl,z,relro should be on by default in ld.gold.