Remove cflags for asm-only target

Since they are no longer passed as arguments to the assemblers.
BUG=none
R=andrew@webrtc.org

Review URL: https://codereview.webrtc.org/1378503002 .

Patch from Andrew Bonventre <andybons@chromium.org>.
1 file changed
tree: 5cabb05b07a02d41b87002771f6de5dfceb515f8
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