OSGeo / PROJ / 3975

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cs2cs, cct, proj and geod: fflush(stdout) after each line to emit each result as soon as it is produced

This is needed when working with pipes, when stdout is not an interactive terminal,
and thus the behaviour is to have it buffered as a regular file, whereas with
an interactive terminal, each newline character causes an implicit flush.

5 of 5 new or added lines in 3 files covered. (100.0%)

41122 of 47540 relevant lines covered (86.5%)

41552.0 hits per line