Linux: for use_system_v8=1, use all_dependent_settings

instead of direct_dependent_settings - with V8 headers
being included in other headers, the former works much better.

This is a configuration that is not used for Google Chrome
neither V8 buildbot, and has been tested for its intended
use case (Linux distributions).

BUG=none

Review URL: https://codereview.chromium.org/12378092
Patch from Paweł Hajdan Jr. <phajdan.jr@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13822 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/gyp/v8.gyp

@@ -1005,7 +1005,7 @@
           'include_dirs++': [
             '<(shim_headers_path)',
           ],
-          'direct_dependent_settings': {
+          'all_dependent_settings': {
             'include_dirs+++': [
               '<(shim_headers_path)',
             ],