Cross-compiling from Linux to Android requires -lrt for the host toolset.

R=yurys@chromium.org

Review URL: https://codereview.chromium.org/23656004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16402 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/gyp/v8.gyp

@@ -722,6 +722,15 @@
                   }],
                 ],
               }, {
+                'link_settings': {
+                  'target_conditions': [
+                    ['_toolset=="host"', {
+                      'libraries': [
+                        '-lrt'
+                      ]
+                    }]
+                  ]
+                },
                 'sources': [
                   '../../src/platform-linux.cc'
                 ]