Fix build with system libpng

Fix build with system libpng

This updates the unbundle file to get back in sync with mainline,
so that targets that depend on libpng_config continue to work.

This is similar to recently landed https://codereview.chromium.org/2808383006 .

This does not affect any build at Google. build/linux/unbundle
is a completely parallel directory tree intended to be used
by Linux distribution packagers. Please see
https://cs.chromium.org/chromium/src/build/linux/unbundle/README
for more context.

BUG=none
R=thestig@chromium.org

Review-Url: https://codereview.chromium.org/2888783003 .
Cr-Commit-Position: refs/heads/master@{#472530}
Committed: https://chromium.googlesource.com/chromium/src/+/fe19263cfa7e714a402a3ed9ed59d304a3da8162

[Paweł Hajdan Jr., 2017-05-17 16:13:53]

phajdan.jr@chromium.org changed reviewers:
+ thestig@chromium.org

[Lei Zhang, 2017-05-17 18:27:16]

lgtm

[Paweł Hajdan Jr., 2017-05-17 19:28:07]

Description was changed from

==========
Fix build with system libpng

This updates the unbundle file to get back in sync with mainline,
so that targets that depend on libpng_config continue to work.

This is similar to recently landed https://codereview.chromium.org/2808383006 .

This does not affect any build at Google. build/linux/unbundle
is a completely parallel directory tree intended to be used
by Linux distribution packagers. Please see
https://cs.chromium.org/chromium/src/build/linux/unbundle/README
for more context.

BUG=none
==========

to

==========
Fix build with system libpng

This updates the unbundle file to get back in sync with mainline,
so that targets that depend on libpng_config continue to work.

This is similar to recently landed https://codereview.chromium.org/2808383006 .

This does not affect any build at Google. build/linux/unbundle
is a completely parallel directory tree intended to be used
by Linux distribution packagers. Please see
https://cs.chromium.org/chromium/src/build/linux/unbundle/README
for more context.

BUG=none
R=thestig@chromium.org

Review-Url: https://codereview.chromium.org/2888783003 .
Cr-Commit-Position: refs/heads/master@{#472530}
Committed:
https://chromium.googlesource.com/chromium/src/+/fe19263cfa7e714a402a3ed9ed59...
==========

[Paweł Hajdan Jr., 2017-05-17 19:28:08]

Committed patchset #1 (id:1) manually as
fe19263cfa7e714a402a3ed9ed59d304a3da8162 (presubmit successful).