Avoid undefined behavior in argp-parse.cQtCreator4.6.2QtCreator4.6.0-rc1QtCreator4.6.0-beta1QtCreator4.6.04.6

The shifting-instead-of-masking trick outlined there is very clever, but
only works incidentally. Explicitly preserve the sign, and still shift,
but shift unsigned values for which left-shifting bits out is defined.

make distcheck complains about the previous code with sufficiently
recent compilers with UB sanitizers.

Change-Id: I6f2942f307a2c154ea7d414a85c60e4f088fc918
Reviewed-by: Christian Kandeler <[email protected]>

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