[MIPS] Set CXX variable used for v8 build

[MIPS] Set CXX variable used for v8 build

This change sets CXX gyp variable for target_arch=="mipsel".
It is a follow up of the change in v8, and it resolves issue of
incorrectly passed m32 flag to MIPS cross toolchain.

Full discussion with Jakob Kummerow and related v8 change can be seen at:

https://codereview.chromium.org/12218113/

BUG= https://code.google.com/p/chromium/issues/detail?id=130022
TEST=make chrome

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=187124

[tony, 2013-03-08 17:49:28]

https://codereview.chromium.org/12699003/diff/1/build/common.gypi
File build/common.gypi (right):

https://codereview.chromium.org/12699003/diff/1/build/common.gypi#newcode619
build/common.gypi:619: 'CXX%': '<!(cd <(DEPTH) && pwd
-P)/mipsel-sysroot/bin/mipsel-linux-gnu-gcc',
Do we need this and line 211?  What if we only had this line and line 1054? 
Would that still work (i.e., the CXX variable would be unset if
target_arch!="mipsel")?

[petarj, 2013-03-08 18:44:39]

https://codereview.chromium.org/12699003/diff/1/build/common.gypi
File build/common.gypi (right):

https://codereview.chromium.org/12699003/diff/1/build/common.gypi#newcode619
build/common.gypi:619: 'CXX%': '<!(cd <(DEPTH) && pwd
-P)/mipsel-sysroot/bin/mipsel-linux-gnu-gcc',
On 2013/03/08 17:49:28, tony wrote:
> Do we need this and line 211?  What if we only had this line and line 1054? 
> Would that still work (i.e., the CXX variable would be unset if
> target_arch!="mipsel")?
You are right, it will work that way too.
Removed in the patch set #2.

[tony, 2013-03-08 19:05:25]

LGTM

[commit-bot: I haz the power, 2013-03-08 23:23:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/petarj@mips.com/12699003/3002

[commit-bot: I haz the power, 2013-03-09 02:51:33]

Change committed as 187124