Disable libbsd support, samba4 uses a global config.h for its own
codebase and that of heimdal (when building with builtin).
This causes redefinition conflicts for link(2) when both standard unistd.h
and bsd/unistd.h get included.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura samba-4.2.0rc1.orig/lib/replace/wscript samba-4.2.0rc1/lib/replace/wscript
--- samba-4.2.0rc1.orig/lib/replace/wscript	2014-10-01 06:17:32.000000000 -0300
+++ samba-4.2.0rc1/lib/replace/wscript	2014-10-01 07:21:13.559498987 -0300
@@ -282,15 +282,6 @@
     conf.CHECK_FUNCS('strtouq strtoll __strtoll strtoq memalign posix_memalign')
     conf.CHECK_FUNCS('prctl')
 
-    # libbsd on some platforms provides strlcpy and strlcat
-    if not conf.CHECK_FUNCS('strlcpy strlcat'):
-        conf.CHECK_FUNCS_IN('strlcpy strlcat', 'bsd', headers='bsd/string.h',
-                checklibc=True)
-    if not conf.CHECK_FUNCS('getpeereid'):
-        conf.CHECK_FUNCS_IN('getpeereid', 'bsd', headers='sys/types.h bsd/unistd.h')
-    if not conf.CHECK_FUNCS_IN('setproctitle', 'setproctitle', headers='setproctitle.h'):
-        conf.CHECK_FUNCS_IN('setproctitle', 'bsd', headers='sys/types.h bsd/unistd.h')
-
     conf.CHECK_CODE('''
                 struct ucred cred;
                 socklen_t cred_len;