* doc/posix-functions/truncl.texi: Mention the OSF/1 5.1 bug.
* m4/truncl.m4 (gl_FUNC_TRUNCL): If gl_FUNC_TRUNCL_IEEE is also used,
test whether truncl works according to ISO C 99 with IEC 60559.
* m4/truncl-ieee.m4: New file.
* modules/truncl-ieee (Files): Add it and m4/minus-zero.m4,
m4/signbit.m4.
(configure.ac): Invoke gl_FUNC_TRUNCL_IEEE.
* modules/truncl-ieee: New file.
* modules/truncl-ieee-tests: New file.
* tests/test-truncl-ieee.c: New file, based on tests/test-truncl.c.
* tests/test-truncl.c (main): Remove signbit tests.
* modules/truncl-tests (Depends-on): Remove signbit.
* doc/posix-functions/truncl.texi: Mention the new module.
* m4/printf.m4 (gl_PRINTF_INFINITE_LONG_DOUBLE): Don't guess yes on
NetBSD; the test fails on NetBSD 5.0.
* doc/{glibc,posix,pastposix}-{headers,functions}/*.texi: Update info
about NetBSD.