log: Work around OSF/1 5.1 bug.

log: Work around OSF/1 5.1 bug.

* lib/math.in.h (log): New declaration.
* lib/log.c: New file.
* m4/log.m4 (gl_FUNC_LOG_WORKS): New macro.
(gl_FUNC_LOG): Invoke it. Set REPLACE_LOG.
* m4/math_h.m4 (gl_MATH_H): Test whether log is declared.
(gl_MATH_H_DEFAULTS): Initialize GNULIB_LOG, REPLACE_LOG.
* modules/math (Makefile.am): Substitute GNULIB_LOG, REPLACE_LOG.
* modules/log (Files): Add lib/log.c.
(Depends-on): Add math.
(configure.ac): If REPLACE_LOG is 1, compile an override.
* tests/test-math-c++.cc: Check the declaration of log.
* doc/posix-functions/log.texi: Mention the OSF/1 5.1 problem.