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FindGperf: support version check

Friedrich W. H. Kossebau requested to merge work/kossebau/findgperfwithversion into master

The version output of gperf has not changed since the initial commit 21 years ago, so for now the regexp should have hopes to ba valid some more time... :)

fprintf (stdout, "GNU gperf %s\n", version_string);

Code done matching the logic found in CMake find modules.

Vesion check needed for dealing with behaviour changes WRT generated code, see also kcodecs!6 (merged)

@cgiboudeaux

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