[Pkg-chromium-maint] Bug#798516: gyp: Upgrade to new upstream version (to support --no-parallel)

[Christopher Hoskin]

The following packages in unstable are failing to rebuild due to this bug:

node-leveldown
node-sqlite3
node-zipfile
node-expat
node-mapnik
node-srs
node-groove
node-postgres
node-stringprep
node-iconv
node-ws

They all fail with the error:

gyp_main.py: error: no such option: --no-parallel

Christopher