Revert "Gentoo's “fax compatibility” patch"

This reverts commit 3413f4c72a7682e1016f6c18b9f909085bb419db.

The patch was originally from Gernot Müller for patching a problem with incompatible fax receivers
[1].
It violates the CAPI specifications and therefore should not be included [2].

[1] http://osdir.com/ml/linux.isdn.capisuite.user/2004-05/msg00043.html
[2] https://github.com/larsimmisch/capisuite/pull/7#issuecomment-26650942