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[libstdc++] Build system cleanup 8/n


HAVE_FLOAT_H is a duplicate definition that was taken out of part 1, due to concerns by Benjamin about it only being checked in crossconfigs.

But it is actually checked for in both various crossconfig and native (line 121 configure.ac). It—like most other headers—is not checked in newlib crossbuilds, which seems wrong. Regardless this patch seems safe.

I actually don't see the reason for why any AC_CHECK_HEADERS would be split into host or target specific checks as checking if a header file exists is quick and wouldn't hurt if it doesn't exist, but I'll queue that cleanup to the next round after acconfig.h makes its long awaited departure.

OK?


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