Revert "Suppress some Mac-specific linker warnings."

[liangfok]

Reverts #5338

It was discovered that this PR resulted in gtest failing to catch exceptions. Specifically, unit tests containing EXPECT_THROW() or EXPECT_ANY_THROW() would fail because the exceptions were not being caught by gTest. Here is an example error:

$ bazel run //drake/systems/primitives:saturation_test
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: Failure at drake/systems/primitives/saturation.cc:23 in Saturation(): condition 'input_size_ > 0' failed.

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This change is 

[liangfok]

@drake-jenkins-bot mac-clang-bazel-nightly-release please

[liangfok]

@drake-jenkins-bot mac-clang-bazel-experimental please.
@drake-jenkins-bot mac-clang-bazel-experimental-everything please.

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Review status: 0 of 1 files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[liangfok]

+@soonho-tri and +@sammy-tri for both levels of review please. I believe this PR can be merged immediately after the mac-clang-bazel-* CI tests pass.

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Review status: 0 of 1 files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[sammy-tri]

Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[sammy-tri]

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Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[soonho-tri]

BTW, I'd like to @david-german-tri to take a look later.

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[liangfok]

Thanks. This PR is now waiting on the following CI test to pass before it can be merged.

https://drake-jenkins.csail.mit.edu/job/mac-clang-bazel-experimental-everything/14/

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Review status: all files reviewed at latest revision, all discussions resolved, some commit checks pending.

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Comments from Reviewable

[BetsyMcPhail]

The mac-clang-bazel-experimental-everything job is still a WIP and depends on a not-yet-merged CI PR. It's status shouldn't hold up this PR.

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Review status: all files reviewed at latest revision, all discussions resolved, some commit checks pending.

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Comments from Reviewable

[liangfok]

Oh, that's great, thanks. What about this build?

https://drake-jenkins.csail.mit.edu/job/mac-clang-bazel-experimental/32/

Should the above CI test hold up this PR from being merged?

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Review status: all files reviewed at latest revision, all discussions resolved, some commit checks pending.

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Comments from Reviewable

[BetsyMcPhail]

The mac-clang-bazel-experimental is a valid test for this PR (https://drake-jenkins.csail.mit.edu/job/mac-clang-bazel-experimental/31 captured the error)

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Review status: all files reviewed at latest revision, all discussions resolved, some commit checks pending.

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Comments from Reviewable

[liangfok]

OK thanks. This PR is now blocked on https://drake-jenkins.csail.mit.edu/job/mac-clang-bazel-experimental/32/ passing.

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Review status: all files reviewed at latest revision, all discussions resolved, some commit checks pending.

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Comments from Reviewable

[jwnimmer-tri]

Passed after 4h42m.