testsuite/arm: Fix bfloat16_vector_typecheck_[12].c tests [PR 112698]

After commit r14-5617-gb8592186611, int32x[24]_t types now use
elements of 'long int' type instead of 'int' on arm-eabi (it's still
'int' on arm-linux-gnueabihf).  Both are 32-bit types anyway.

This patch adjust the two tests so that they optionnally accept 'long '
before 'int' in the expected error message.

2023-11-30  Christophe Lyon  <christophe.lyon@linaro.org>

	PR target/112698
	gcc/testsuite/
	* gcc.target/arm/bfloat16_vector_typecheck_1.c: Update expected
	error message.
	* gcc.target/arm/bfloat16_vector_typecheck_2.c: Likewise.