Attempt to fix compilation with clang >= 3.5: undeclared identifier '__float128'
Attempt to fix compilation with clang >= 3.5: undeclared identifier '__float128'

From clang 3.5, we may have the following:

	/usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9/type_traits:279:39:
	error: use of undeclared identifier '__float128'
	    struct __is_floating_point_helper<__float128>

It seems that clang does not currently support __float128. The
macro `__STRICT_ANSI__` does not resolve anything

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