* lib/fdleak.c: Include <stdarg.h> and "cloexec.h".
(open_cloexec): Support O_CREAT. Use O_CLOEXEC if it is available.
(O_CLOEXEC): #define to 0 if not already #defined.
* import-gnulib.config (modules): Import modules open (for
PROMOTED_MODE_T) and stdbool (for 'true').
* lib/fdleak.h: Update prototype of open_cloexec to allow mode to
be passed.
Signed-off-by: James Youngman <jay@gnu.org>