ENH: support compilation on FreeBSD (contribution from A. Kulkarmi)

Utilities/FLTK/src/filename_list.cxx

Utilities/otbedison/edge/BgGlobalFc.cpp

Utilities/otbossim/src/ossim/base/ossimDate.cpp

Utilities/otbossim/src/ossim/vpfutil/linklist.c

Utilities/otbossim/src/ossim/vpfutil/vpfclip.c

Utilities/otbossim/src/ossim/vpfutil/vpfcntnt.c

Utilities/otbossim/src/ossim/vpfutil/vpfdict.c

Utilities/otbossim/src/ossim/vpfutil/vpfdisp.c

Utilities/otbossim/src/ossim/vpfutil/vpfmisc.c

Utilities/otbossim/src/ossim/vpfutil/vpfprim.c

Utilities/otbossim/src/ossim/vpfutil/vpfquery.c

Utilities/otbossim/src/ossim/vpfutil/vpfrelat.c

Utilities/otbossim/src/ossim/vpfutil/vpfselec.c