NaCl: Add the integrated runtime (IRT) library to install images

NaCl: Add the integrated runtime (IRT) library to install images

Mac (x86-32 only):
chrome/chrome_dll.gypi

Linux (x86-32 or x86-64, depending on the target arch):
chrome/chrome_installer.gypi
chrome/tools/build/linux/FILES.cfg

Windows (both x86-32 and x86-64 in the same install image)
chrome/installer/mini_installer.gyp
chrome/installer/mini_installer/chrome.release
chrome/tools/build/win/FILES.cfg

I am not sure if I need to add to the lists in
chrome/tools/build/{linux,win}/FILES.  Since there are files listed in
FILES.cfg that are not in FILES, I will assume not.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=1595
TEST=not sure how to test this, apart from manually testing the
  install images that are produced after this is committed

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=84252

[bradn, 2011-05-04 18:23:43]

LGTM

[bradn, 2011-05-04 18:28:30]

Oh and on closer inspection, I don't think you need the p4 location as this is a
nexe.