Drop include for features.h
Drop include for features.h

The following information is taken from the feature_test_macros man
page:

<features.h> is a Linux/glibc-specific header file.  Other systems have
an analogous file, but typically with a different name.  This header
file is automatically included by other header files as required: it is
not necessary to explicitly include it in order to employ feature test
macros.

Reported-by: Tibor Vago <95ee918491a9555d8c0669f2d1ecab54c2b32c5c@gmail.com>
X-Gentoo-Bug: 399635
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=399635

OpenRC/openrc,dwfreed/openrc,williamh/openrc,OpenRC/openrc,dwfreed/openrc,dwfreed/openrc,williamh/openrc,OpenRC/openrc,williamh/openrc