Portability problem reported by Kevin Cernekee in:
http://lists.gnu.org/archive/html/bug-gnulib/2015-02/msg00122.html
* doc/posix-headers/sys_resource.texi (sys/resource.h):
Mention the portability problem.
* lib/getdtablesize.c (RLIM_SAVED_CUR, RLIM_SAVED_MAX):
Define if not defined.
* m4/dup2.m4 (gl_FUNC_DUP2):
* m4/fcntl.m4 (gl_FUNC_FCNTL):
Likewise.
* lib/sys_resource.in.h: New file.
* m4/sys_resource_h.m4: New file.
* modules/sys_resource: New file.
* doc/posix-headers/sys_resource.texi: Mention the new module.
* tests/test-c-stack.c [HAVE_SETRLIMIT]: Include prerequisite
headers before <sys/resource.h>.
* doc/posix-headers/sys_resource.texi (sys/resource.h): Document
the bug.
Reported by Nelson H. F. Beebe.
Signed-off-by: Eric Blake <ebb9@byu.net>