chore: revert backport of legacy OCSP APIs in boringssl

[nornagon]

This reverts commit 714d2ea8908e1659b16bdb1bbf525b9ad5c8a84b (PR #628).

1. This didn't actually fix the test. The test was actually fixed by electron/node#46.
2. This change actually doesn't even enable usage of the OCSP APIs in node, because node expects the functions to be macros and checks for them with #ifdef, but boringssl defines the functions as real functions, so #ifdef doesn't detect that they're defined.

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