[PATCH] Optimize config_read()

[Timo Teräs]

Timo Teräs wrote:
> Vladimir Dronnikov wrote:
> And meanwhile 'parse' testsuite, please.
> 
> Ah, shows one bug, PARSE_TRIM does not trim delimiters from end of the
> last token. Will fix.

Ok, fixed. Also modified the code the be smaller as the fixes made it
bigger.

It's currently "only" about -75 bytes, but the speed is faster and
to some degree more readable (IMO).

Passes "parse" and "mdev" test suites.

Consider applying.

- Timo
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