[fcl] Explicity handle FCL_USE_X64_SSE CMake option

[traversaro]

The FCL_USE_X64_SSE option is enabled by default in fcl, but it only make sense to enable SSE flags when targeting either x86 or x64.

Related upstream PR: flexible-collision-library/fcl#470 .

• What does your PR fix? There is no relative issue.

• Which triplets are supported/not supported? Have you updated the CI baseline? The CI baseline should not change.

• Does your PR follow the maintainer guide? Yes

[PhoebeHui]

@traversaro, thanks for the PR!

Could you also update the Version to '0.6.0-1' in CONTROL file?

[traversaro]

@traversaro, thanks for the PR!

Could you also update the Version to '0.6.0-1' in CONTROL file?

Done in traversaro@a02bab8 .

[PhoebeHui]

Thanks for the udpates!

[PhoebeHui]

The CI failed on 'git checkout' step, it doesn't related to this change, @strega-nil, could you help have a look?

[strega-nil]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[strega-nil]

Cools, LGTM! Thanks @traversaro :)

I'll wait for the CI to finish and then merge.

[PhoebeHui]

The CI failures doesn't relate to this changes.
Protobuf with arm/uwp failed due to it requires x86-windows protoc to be available, this is expected, PR #11459 would fix it.

Failures:
CMake Error at ports/protobuf/portfile.cmake:21 (message):
Cross-targetting protobuf requires the x86-windows protoc to be available.
Please install protobuf:x86-windows first.

[strega-nil]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[strega-nil]

Alright, it passed! Thanks @traversaro :)