This reverts commit
f30b16edb467484d8d9e5a5b5fd665b83a90ddc9.
It seems better to use original solution and depend on HAVE_DIRFD
and HAVE_OPENAT, because libblkid and another tools are compiled
on non-Linux targets too.
if HAVE_OPENAT
if HAVE_DIRFD
libcommon_la_SOURCES += lib/path.c
-if LINUX
libcommon_la_SOURCES += lib/sysfs.c
libcommon_la_SOURCES += lib/procfs.c
endif
endif
-endif
EXTRA_LTLIBRARIES += libtcolors.la
libtcolors_la_CFLAGS = $(AM_CFLAGS)