When building OpenSSL, the OpenBSD/FreeBSD/DFBSD code in crypto/uid.c calls issetugid(). Add the declaration of this function to CrtLibSupport.h to avoid the need to patch the openssl code on these platforms. Signed-off-by: Rebecca Cran <rebecca@bluestop.org> Reviewed-by: Jian Wang <jian.j.wang@intel.com>