lib/replace: move lib/replace/closefrom.c from ROKEN_HOSTCC_SOURCE to REPLACE_HOSTCC_...

lib/replace: move lib/replace/closefrom.c from ROKEN_HOSTCC_SOURCE to REPLACE_HOSTCC_SOURCE

This is where it really belongs and we avoid the strange interaction
with source4/heimdal_build/config.h. This a follow up for commit
f31333d40e6fa38daa32a3ebb32d5a317c06fc62.

This fixes a build problem if libbsd-dev is not installed.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14482

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Björn Jacke <bjacke@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Tue Sep  8 13:59:58 UTC 2020 on sn-devel-184

(cherry picked from commit 0022cd94587b805a525b0b9ef71ff0f15780424a)

Autobuild-User(v4-12-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-12-test): Wed Sep  9 14:16:26 UTC 2020 on sn-devel-184