Fixed 'out of tree' compilation

[Jacek Caban]

This patch fixes the problem of 'out of tree' compilation reported
by Stefan Leichter. It initializes pp_status.input before calling
add_cmdline_defines which depends on it. It also fixes the bug
(AFAIK never reported, but present) causing a infinite loop and
adds some small optimalizations.

Changelog:
    - Added initializing pp_status.input at begin of wpp_parse
    - Fixed infinite loop bug
    - Code cleanup

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