Bug 891632 - Port NO_DIST_INSTALL to moz.build; r=joey

Many of the moved variables are likely not needed. moz.build should one
day validate the sandbox's output and error if "useless" variables are
present.

--HG--
extra : rebase_source : 3abdea056c18d00ede8c15b37db60532eca58630
Bug 891626 - Consistent filename casing for "ipc"; r=bsmedberg

"ipc" and "IPC" are used to refer to the same directory. "ipc" is more
popular than "IPC" so the latter has been downcased.

--HG--
extra : rebase_source : 378d442df62b8e401ed2a10f36889cfce6e88227