Fix issue #87: fails to build on linux headers 3.13

Commit 80b10107cb added #include <linux/fcntl.h> in
src/accelerometer and friends for builds on uclibc.
This only works with glibc and musl systems with
linux headers 3.9 but fails with linux headers 3.13.

We keep <linux/fcntl.h> but drop <fcntl.h>.

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>