* lib/math.in.h (getpayload): New declaration.
* lib/getpayload.c: New file.
* m4/getpayload.m4: New file.
* m4/math_h.m4 (gl_MATH_H): Test whether getpayload is declared.
(gl_MATH_H_REQUIRE_DEFAULTS): Initialize GNULIB_GETPAYLOAD.
(gl_MATH_H_DEFAULTS): Initialize HAVE_GETPAYLOAD, REPLACE_GETPAYLOAD.
* modules/math (Makefile.am): Substitute GNULIB_GETPAYLOAD,
HAVE_GETPAYLOAD, REPLACE_GETPAYLOAD.
* modules/getpayload: New file.
* doc/posix-functions/getpayload.texi: Mention the new module and the
glibc bug.