Move system_libdir to a deeper variable dict to fix issue 369119

Move system_libdir to a deeper variable dict to fix issue 369119
(system_libdir being undefined in third_party/harfbuzz-ng/harfbuzz.gyp)

BUG=369119
R=thakis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274680

[Alexander Potapenko, 2014-06-03 10:38:03]

Nico, can you please take a look?
I do not fully understand why this fixes the problem mentioned in
https://code.google.com/p/chromium/issues/detail?id=369119#c15:

gyp: Undefined variable system_libdir in
/mnt/data/b/build/slave/ASan_Debug__32-bit_x86_with_V8-ARM_/build/src/third_party/harfbuzz-ng/harfbuzz.gyp

But moving the declaration of |system_libdir| next to |sysroot|, which is
apparently defined in the context of harfbuzz.gyp, seems to help.

[Nico, 2014-06-03 14:11:37]

Probably makes more sense if the folks who added system_libdir look at this?

[Alexander Potapenko, 2014-06-03 14:23:37]

Agreed.
Mike, can you please take a look?

[vapier, 2014-06-03 19:24:43]

lgtm

lgtm

[Alexander Potapenko, 2014-06-03 19:53:03]

The CQ bit was checked by glider@chromium.org

[commit-bot: I haz the power, 2014-06-03 19:54:17]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/glider@chromium.org/309253003/1

[commit-bot: I haz the power, 2014-06-04 00:17:14]

Change committed as 274680