Patchelf is now built dynamically

Until a few commits ago, PatchELF was built statically because it was used
to patch `libstdc++' at the end of the GCC building phase, but PatchELF
also depends on `libstdc++', so it would crash. However, recently when
patching the GCC libraries, we don't directly apply Patchelf to the
library, first we copy it to a temporary place, do the patching, then put
it in its proper place. So the problem above won't happen any more.

With this commit, I am thus removing the static flag from patchelf and
letting it built dynamically all the time. The main problem was that some
systems don't have a static C++ library, so PatchELF couldn't be built
statically. Instead of adding more checks, we just fixed the core
foundation of the problem.

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