Skip PIE indirect5 and indirect6 tests on i386

Skip PIE indirect5 and indirect6 tests on i386

On i386, since GOT reference is needed to access global symbols in PIE,
those symbols are made dynamic.  Crash happens when there is a reference
to the same global symbol with a different symbol type in a shared
object.  Since mixing different types of the same symbol doesn't work in
general, this patch skips those tests on i386 as well as compiles non-PIE
indirect5 and indirect6 tests with $NOPIE_LDFLAGS and $NOPIE_CFLAGS.

	PR ld/21402
	* testsuite/ld-elf/indirect.exp: Pass $NOPIE_LDFLAGS and
	$NOPIE_CFLAGS to non-PIE indirect5 and indirect6 tests.  Skip
	PIE indirect5 and indirect6 tests on i386.