core/minute-ia: Disable flag when using clang
core/minute-ia: Disable flag when using clang

"-mno-accumulate-outgoing-args" is not a flag that clang understands.

BRANCH=ish
BUG=b:172020503
TEST=none

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: I897a491d7b7c91d21d8cfa1cfb9d8470c1240650
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3193274
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec