arm: Look for __SOFTFP__ besides __SOFTP.

r11951 changed the existing check for the __SOFTFP__ define in ARM platforms
to a check for __SOFTP. Most other programs look for __SOFTFP__ [1], so
look for both to increase the chances of not erroring out when using GCC 4.5.

[1] Based on http://codesearch.debian.net/search?q=__SOFTFP__ vs
    http://codesearch.debian.net/search?q=__SOFTFP[^_]

BUG=v8:2140
R=bmeurer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16070

[Benedikt Meurer, 2013-08-06 06:56:01]

Hm, why not test for __SOFTFP__ or __SOFTFP? I don't like to break builds that
work right now because we're testing for __SOFTFP.

[Raphael Kubo da Costa (rakuco), 2013-08-06 08:32:47]

On 2013/08/06 06:56:01, Benedikt Meurer wrote:
> Hm, why not test for __SOFTFP__ or __SOFTFP? I don't like to break builds that
> work right now because we're testing for __SOFTFP.

All done, sir.

[Raphael Kubo da Costa (rakuco), 2013-08-06 10:33:17]

I've also updated the commit message in the CL.

[Benedikt Meurer, 2013-08-06 10:33:53]

LGTM

[Benedikt Meurer, 2013-08-06 11:08:42]

Committed patchset #2 manually as r16070 (presubmit successful).