Fix warning linking static libraries on OS X 10.9

Fix warning linking static libraries on OS X 10.9

libtool on OS X 10.9 will output message such as:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: gen/third_party/libvpx/x86inc.o has no symbols

instead of

libtool: file: gen/third_party/libvpx/x86inc.o has no symbols

As a result, the pattern used by gyp-mac-tool to filter these
kind of messages (r'libtool: file: .* has no symbols$') no longer
works. Extend the pattern a little bit to support output with
full directory names.

gyp r1769

[Jiang Jiang, 2013-10-10 19:44:23]

I'm trying to building Opera/Chromium on OS X 10.9 GM (with Xcode 5.0.1 GM) and
got tons of these warnings.

[Nico, 2013-10-10 19:56:01]

lgtm

https://codereview.chromium.org/26912003/diff/1/pylib/gyp/mac_tool.py
File pylib/gyp/mac_tool.py (right):

https://codereview.chromium.org/26912003/diff/1/pylib/gyp/mac_tool.py#newcode203
pylib/gyp/mac_tool.py:203: """Calls libtool and filters out 'libtool: file:
foo.o has no symbols'."""
change the comment to say '/path/to/libtool: file: foo.o has no symbols' please

[Jiang Jiang, 2013-10-10 20:00:20]

On 2013/10/10 19:56:01, Nico wrote:
> lgtm
> 
> https://codereview.chromium.org/26912003/diff/1/pylib/gyp/mac_tool.py
> File pylib/gyp/mac_tool.py (right):
> 
>
https://codereview.chromium.org/26912003/diff/1/pylib/gyp/mac_tool.py#newcode203
> pylib/gyp/mac_tool.py:203: """Calls libtool and filters out 'libtool: file:
> foo.o has no symbols'."""
> change the comment to say '/path/to/libtool: file: foo.o has no symbols'
please

Done.

[Jiang Jiang, 2013-10-10 21:20:20]

On 2013/10/10 20:00:20, Jiang wrote:
> On 2013/10/10 19:56:01, Nico wrote:
> > lgtm
> > 
> > https://codereview.chromium.org/26912003/diff/1/pylib/gyp/mac_tool.py
> > File pylib/gyp/mac_tool.py (right):
> > 
> >
>
https://codereview.chromium.org/26912003/diff/1/pylib/gyp/mac_tool.py#newcode203
> > pylib/gyp/mac_tool.py:203: """Calls libtool and filters out 'libtool: file:
> > foo.o has no symbols'."""
> > change the comment to say '/path/to/libtool: file: foo.o has no symbols'
> please
> 
> Done.

I assumed that I need someone else to commit it for me?

[Nico, 2013-11-17 10:05:42]

I landed this over a month ago in gyp r1769, but didn't reply on this review,
sorry.