Add emscripten support to config.sub

Add emscripten support to config.sub

This allows use to pass --host=emscripten to configure
scripts and have it correctly detect cross compilation.

R=gdeepti@google.com

Committed: https://chromium.googlesource.com/external/naclports/+/738eb2f282768d7c1fb6c0aa86eda71991dda9be

[Sam Clegg, 2015-10-08 20:56:35]

sbc@chromium.org changed reviewers:
+ gdeepti@chromium.org

[Roland McGrath, 2015-10-08 20:59:57]

Have you proposed the config.sub change upstream?

[Sam Clegg, 2015-10-08 21:07:56]

On 2015/10/08 20:59:57, Roland McGrath wrote:
> Have you proposed the config.sub change upstream?

No..  but I did take inspiration from this proposed upstream patch:
http://lists.gnu.org/archive/html/config-patches/2015-02/msg00019.html

I guess I should at least see if it landed or not.

[Sam Clegg, 2015-10-08 21:11:58]

On 2015/10/08 21:07:56, Sam Clegg wrote:
> On 2015/10/08 20:59:57, Roland McGrath wrote:
> > Have you proposed the config.sub change upstream?
> 
> No..  but I did take inspiration from this proposed upstream patch:
> http://lists.gnu.org/archive/html/config-patches/2015-02/msg00019.html
> 
> I guess I should at least see if it landed or not.

It hasn't landed upstream yet.  I think it makes sense to leave it to the
emscripten authors to take care of pushing on that.

[Sam Clegg, 2015-10-08 21:28:35]

Patchset #3 (id:40001) has been deleted

[gdeepti1, 2015-10-08 23:57:13]

gdeepti@google.com changed reviewers:
+ gdeepti@google.com

[gdeepti1, 2015-10-08 23:57:13]

lgtm

[Sam Clegg, 2015-10-09 00:43:46]

Committed patchset #3 (id:60001) manually as
738eb2f282768d7c1fb6c0aa86eda71991dda9be (presubmit successful).