[fixincludes] solaris_pow_int_overload should use __cplusplus

[Rainer Orth]

Work is going on to incorporate all applicable fixincludes fixes into
the Solaris headers proper.  One fix is currently problematic since it
uses an G++-internal macro (__GXX_EXPERIMENTAL_CXX0X__) where libstdc++
<cmath> already switched to testing __cplusplus.  The following patch
updates the fix to match <cmath>.

Tested by mainline bootstraps on i386-pc-solaris2.11,
sparc-sun-solaris2.11 and 4.8 bootstrap on i386-pc-solaris2.10.

Ok for mainline and 4.8 branch if they pass?

Thanks.
	Rainer


2013-05-15  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* inclhack.def (solaris_pow_int_overload): Update comment.
	Change guard to match <cmath>.
	* fixincl.x: Regenerate.
	* tests/base/iso/math_iso.h [SOLARIS_POW_INT_OVERLOAD_CHECK]:
	Matching change.

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Rainer Orth, Center for Biotechnology, Bielefeld University