Roll gyp to r1656

Roll gyp to r1656

r1656 contains a bug fix for the make generator to correctly regenerate
Makefiles if a gyp was touched. Before, it would assume that it is
running in the top-level directory. However, the v8 standalone build
puts the generated Makefile into the out subdirectory, and so gyp
failed to locate the gyp binary.

BUG=none
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18053015

Patch from Jochen Eisinger <jochen@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15388 ce2b1a6d-e550-0410-aec6-3dcde31c8c00