[PATCH][BZ #22243] fix log2(0) and log(10) in downward rounding

[Szabolcs Nagy]

On 64bit targets if the SVID compat wrapper is suppressed (e.g. static linking)
then log2(0) and log10(0) returned inf instead of -inf.

2017-10-03  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	[BZ #22243]
	* sysdeps/ieee754/dbl-64/wordsize-64/e_log10.c (__ieee754_log10): Use fabs.
	* sysdeps/ieee754/dbl-64/wordsize-64/e_log2.c (__ieee754_log2): Likewise.

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