PPC970: 6954845d8 breaks build

[pkubaj]

FreeBSD 15.0-RELEASE, powerpc64, PPC970

TEST 41/123 zscal:i00_NAN_incx_2 [FAIL]
  ERR: test_zscal.c:639  should be true
TEST 42/123 zscal:i00_NAN [FAIL]
  ERR: test_zscal.c:625  should be true
TEST 53/123 cscal:i00_NAN_incx_2 [FAIL]
  ERR: test_zscal.c:466  should be true
TEST 54/123 cscal:i00_NAN [FAIL]
  ERR: test_zscal.c:452  should be true
RESULTS: 123 tests (119 ok, 4 failed, 0 skipped) ran in 172 ms

[martin-frbg]

Not sure what happened here - either I tested in the wrong environment, or I managed to commit with a different stack address value than I tested. Hopefully fixed now, but I have to rely on building for PPC970 on more recent POWER hardware