Set CONFIG += benchmark in corelib's various benchmarks

This leads to "make benchmark" actually running the benchmark, which
would be nice, I think. Purged various CONFIG += release or -= debug
lines from the same configurations; those surely only configure how
the test code is compiled, which is more or less pointless; it's the
code under test whose debug/release state matters, and I don't suppose
that's affected by the build config of the test code.

In the process, reduce diversity of the ordering of lines within these
*.pro files and purge some dangling space.

Change-Id: Ia9f9f0ca4c096262de928806bdfa6ea3b9e7b9ba
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

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