strfmon_l: Fix -fsanitize=address finding. * lib/strfmon_l.c: Include <errno.h>, <stdbool.h>, <stdlib.h>, <string.h>. (MAX_ARGS): Renamed from MAX_ARG_WORDS. (directive_t, directives_t): New types. (fmon_parse): New function. (rpl_strfmon_l): Don't call va_arg more often than needed for the format string. Consume 'long double' arguments in places where the format string indicates so. * modules/strfmon_l (Depends-on): Add 'stdbool'.

Files:
tests/test-xstdopen.c
tests/test-xstdopen.sh
tests/macros.h

Depends-on:
test-framework-sh

Makefile.am:
TESTS += test-xstdopen.sh
check_PROGRAMS += test-xstdopen
test_xstdopen_LDADD = $(LDADD) @LIBINTL@