Adds -ghc-version flag to ghc.
Summary: When building the rts with ghc (e.g. using ghc as a c compiler), ghc's "Value Add" is, it includes adding `-include /path/to/ghcversion.h`. For this it looksup the rts package in the package database, which--if empty--fails. Thus to allow compiling C files with GHC, we add the `-ghc-version` flag, which takes the path to the `ghcversion.h` file. A `-no-ghc-version` flag was omitted, as at that point it becomes questionable why one would use ghc to compile c if one doesn't any of the added value. --  from `compiler/main/DriverPipeline.hs` > -- add package include paths even if we're just compiling .c > -- files; this is the Value Add(TM) that using ghc instead of > -- gcc gives you :) Reviewers: bgamari, geekosaur, austin Reviewed By: bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D4135
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