libcap-ng: add pthread library if header is found

If the pthread.h header is found, make sure library containing
"pthread_atfork" is added to the list of libraries against which to
link. On some hosts (e.g. openSUSE 15.1) "-lpthread" needs to be
explicitly added in order for the code to compile correctly.

We already had a workaround for this for native builds, but using some
external toolchains, we can be bit by this for the target recipe as
well.

Most of this is courtesy Trevor Woerner <twoerner@gmail.com>, via his
patch at stevegrubb/libcap-ng#10, the last thanks to Khem Raj.

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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