Again, use the infrastructure available to improve the compatibility
of these tests.

gcc/testsuite:

	* gcc.target/arm/pr78353-1.c: Use dg-add-options to manage target
	flags.
	* gcc.target/arm/pr78353-2.c: Likewise.
---
 gcc/testsuite/gcc.target/arm/pr78353-1.c | 3 ++-
 gcc/testsuite/gcc.target/arm/pr78353-2.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)