Additional upcxx-meta outputs

[Paul Hargrove]

In the "after party" from the 2017.09.15 spec call we identified four things that should be added to the upcxx-meta outputs:

• CC
• CXX
• CONDUIT
• Path to the GASNet install

[Former user]

Fixed issue 39. Further progress on issue 11, can now dictate that nobs install (properly) gasnet by setting GASNET_INSTALL_TO in environment.

→ <<cset 96f8534cfe21>>