Siddhesh Poyarekar 7a9ebfa159 Use IS_IN internally only
This change is only useful for the conformance tests since the headers
changed are not installed.  The conformance tests fail due to IS_IN
not being defined, so wrap it with a check to make sure that _ISOMAC
is defined.

	* include/bits/stdlib-float.h: Use IS_IN only if _ISOMAC is
	defined.
	* include/mqueue.h: Likewise.
	* include/stdlib.h: Likewise.
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