testsuite/101269: fix testcase when used with -m32

testsuite/101269: fix testcase when used with -m32

PR testsuite/101269 - new test case gcc.dg/debug/btf/btf-datasec-1.c
fails with its introduction in r12-1852

BTF datasec records for .rodata/.data are expected for now for all targets.
For powerpc based targets, use -msdata=none when ilp32 is enabled.

2021-07-09  Indu Bhagat  <indu.bhagat@oracle.com>

gcc/testsuite/ChangeLog:

	PR testsuite/101269
	* gcc.dg/debug/btf/btf-datasec-1.c: Force -msdata=none with ilp32 for
	powerpc based targets.