Fix the Folly OSS build by guarding the include of range-v3 header
Summary: Folly OSS does not list range-v3 as a dependency. As a result, test/RangeTest.cpp fails to compile because it tries to include a range-v3 header. This change gates the inclusion of the header with `__has_include`, making the dependency optional. Reviewed By: yfeldblum Differential Revision: D20839733 fbshipit-source-id: 2d5e9c17427a0913f40f1ee80e868e27080a68f0
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