[issue39575] `coverage` build target should use --coverage instead of -lgcov

[MaskRay]

New submission from MaskRay <maskray at google.com>:

This allows clang to get rid of the dependency on libgcov.
When linking, GCC passes -lgcov while clang passes the path to libclang_rt.profile-$arch.a

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components: Build
messages: 361528
nosy: MaskRay
priority: normal
severity: normal
status: open
title: `coverage` build target should use --coverage instead of -lgcov
type: enhancement
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39575>
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