Move rpath ldflags under is_component_build

Move rpath ldflags under is_component_build

The shared library flags currently being passed should only be passed in
component builds. The location of dylibs in a non-component build is already
known so it’s superfluous to specify additional search paths via rpath.

-search_paths_first is the default on ld starting with the Xcode4 toolchain.
-L. isn’t needed since the absolute path of the dylib is being specified at link time.

R=mark,dpranke,thakis
BUG=345021
Committed: https://crrev.com/465929bd9eccfd0de10965867e0378eee4a24dd5
Cr-Commit-Position: refs/heads/master@{#343793}

[Bons, 2015-08-17 22:31:40]

andybons@chromium.org changed reviewers:
+ dpranke@chromium.org, mark@chromium.org, thakis@chromium.org
- dpranke@google.com, mcolbert@chromium.org

[Mark Mentovai, 2015-08-17 22:34:44]

I’m not competent to review .gn but I am competent to say that the change
appears correct and what you’ve described is also correct. LGTM.

[Dirk Pranke, 2015-08-18 01:45:09]

lgtm

[Bons, 2015-08-18 01:45:56]

The CQ bit was checked by andybons@chromium.org

[commit-bot: I haz the power, 2015-08-18 01:47:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1298783003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1298783003/1

[commit-bot: I haz the power, 2015-08-18 02:15:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-18 02:16:18]

Patchset 1 (id:??) landed as
https://crrev.com/465929bd9eccfd0de10965867e0378eee4a24dd5
Cr-Commit-Position: refs/heads/master@{#343793}