LU-3249 tests: build POSIX test suite on FC18

LU-3249 tests: build POSIX test suite on FC18

While building POSIX test suite, some required header files are
not in the /usr/include directory on Fedora 18 distribution. On
FC18, only arm-gp2x-linux-glibc-2.3.6-11.fc18.noarch.rpm contains
those header files. This patch links those header files to the
standard system directory so as to make the building pass.

Test-Parameters: envdefinitions=SLOW=yes \
clientdistro=fc18 serverdistro=el6 clientarch=x86_64 \
serverarch=x86_64 testlist=posix

Signed-off-by: Jian Yu <jian.yu@intel.com>
Change-Id: Idf622606d730d80a44e341bf7317dda37ea6bf82
Reviewed-on: http://review.whamcloud.com/7644
Reviewed-by: Minh Diep <minh.diep@intel.com>
Tested-by: Hudson
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>