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rts: Build ticky GHC with single-threaded RTS

Matthew Pickering requested to merge wip/hadrian-ticky into master

The threaded RTS allows you to use ticky profiling but only for the counters in the generated code. The counters used in the C portion of the RTS are disabled. Updating the counters is also racy using the threaded RTS which can lead to misleading or incorrect ticky results.

Therefore we change the hadrian flavour to build using the single-threaded RTS (mainly in order to get accurate C code counter increments)

Fixes #23430 (closed)

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