Add missing unistd.h header for close() function
Add missing unistd.h header for close() function

The close(2) function was causing a compilation error when building the
plugin as standalone via cmake.

Change-Id: I825423129f6418bfdb8248d78500200d3f7cccb2
Signed-off-by: Mattijs Korpershoek <688bc74912fe9ce1ef683b8bba9739e4e60eb0b7@intel.com>

clero/parameter-framework-plugins-filesystem,01org/parameter-framework-plugins-filesystem,clero/parameter-framework-plugins-filesystem,android-ia/vendor_intel_hardware_audiocomms_parameter-framework_plugins_fs,android-ia/vendor_intel_hardware_audiocomms_parameter-framework_plugins_fs,01org/parameter-framework-plugins-filesystem