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ilogbl: Ensure replacement on Haiku.
* m4/ilogbl.m4 (gl_FUNC_ILOGBL): Invoke gl_FUNC_ILOGBL_WORKS and set
REPLACE_ILOGBL if ilogbl does not work.
(gl_FUNC_ILOGBL_WORKS): New macro.
* lib/math.in.h (ilogbl): Replace if REPLACE_ILOGBL is 1.
* m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_ILOGBL.
* modules/math (Makefile.am): Substitute REPLACE_ILOGBL.
* modules/ilogbl (Depends-on, configure.ac): Consider REPLACE_ILOGBL.
* doc/posix-functions/ilogbl.texi: Mention the Haiku problem.