Explicit declare drm library directory

Explicit declare drm library directory

I found this issue, while trying to use libdrm with some custom changes
and not installed in the default system path. We are already checking
drm system library and cflags using pkg, this patch extends it for
the directory too.

Committed: https://crrev.com/d1c9e302bc024e90299771d20b59bc6b5d18d999
Cr-Commit-Position: refs/heads/master@{#342229}

[kalyank, 2015-08-03 19:48:03]

kalyan.kondapally@intel.com changed reviewers:
+ alexst@chromium.org

[alexst (slow to review), 2015-08-04 13:41:04]

alexst@chromium.org changed reviewers:
+ spang@chromium.org

[alexst (slow to review), 2015-08-04 13:41:40]

Have spang look at it, my gyp skills are weak! :)

[spang, 2015-08-04 15:16:39]

spang@chromium.org changed reviewers:
+ jochen@chromium.org

[spang, 2015-08-04 15:16:39]

lgtm

[kalyank, 2015-08-05 16:09:17]

On 2015/08/04 15:16:39, spang wrote:
> lgtm

@Jochen, Can you PTAL and do the Owner review.

[jochen (gone - plz use gerrit), 2015-08-06 07:44:55]

lgtm

[kalyank, 2015-08-06 15:39:07]

The CQ bit was checked by kalyan.kondapally@intel.com

[commit-bot: I haz the power, 2015-08-06 15:39:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1254133009/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1254133009/1

[commit-bot: I haz the power, 2015-08-06 17:28:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-06 17:28:37]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[spang, 2015-08-06 22:27:13]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-08-06 22:29:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1254133009/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1254133009/1

[commit-bot: I haz the power, 2015-08-06 23:20:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-06 23:21:40]

Patchset 1 (id:??) landed as
https://crrev.com/d1c9e302bc024e90299771d20b59bc6b5d18d999
Cr-Commit-Position: refs/heads/master@{#342229}