aarch64: Skip whilele_1.C test for ILP32

The definitions of the integer types for ILP32 newlib make the
resolution of some of the bool-related tests ambiguous.

2020-01-23  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
	* g++.target/aarch64/sve/acle/general-c++/whilele_1.C: Skip for ILP32.