`--with-ghc` flag produces error

Summary

Using the --with-ghc flag to specify a GHC usable by ./configure after installing a development snapshot produces an error.

Steps to reproduce

Run make install on master's HEAD
Run ./configure --with-ghc=<usable-ghc>, where <usable-ghc> is the path to a version of GHC that is not a development snapshot.

Expected behavior

You should see configure: error: --with-ghc=<usable-ghc> is obsolete (use './configure GHC=<usable-ghc>' or 'GHC=<usable-ghc> ./configure' instead)

Environment

GHC version used: Any

Optional:

Operating System:
System Architecture:

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