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This CL implements the mechanism to pass an irt querying function to the plugin
process via AT_SYSINFO. Also, as the first step to implement many irt functions
for non-SFI mode, this CL introduces nacl_irt_basic.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3734
TEST=Tried to call a newly added function from plugin via AT_SYSINFO.

Review URL: https://codereview.chromium.org/125533004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244144 0039d316-1c4b-4281-b951-d872f2087c98