Important change was made in 1.0.18: all sub-libs were merged
in one and only libc similarly to musl.
See [1] for more details.
To support that we had to remove refences to those sub-libs like
libpthread, libcrypt, libdl, libm, libutil etc.
[1] http://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=29ff9055c80efe77a7130767a9fcb3ab8c67e8ce
Signed-off-by: Alexey Brodkin <Alexey.Brodkin@synopsys.com>