afl-clang-fast: remove useless codes related to maybe_linking

[QinlinChen]

Now that the maybe_linking check is removed in afl-clang-fast.c, maybe it is better to remove useless codes caused by it since maybe_linking is now defined but not used.

I think in the old code, "maybe_linking" should not be set to zero on seeing the "-shared" argument because dynamic libraries should also statically link the AFL runtime into themselves. But now that the maybe_linking variable is removed, it is no more a problem.

Besides, the code 'if (argc == 1 && !strcmp(argv[1], "-v")) maybe_linking = 0;' in line 146 itself is useless regardless of the maybe_linking variable because in main() we have check "if argc < 2, then exit".

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[QinlinChen]

@googlebot I signed it!

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[lszekeres]

Just linking the PR that removed the usage of maybe_linking for reference: #80

[lszekeres]

LGTM

[jonathanmetzman]

LGTM. I'll merge this when I'm not OOO next week if someone else doesn't first.