avoid using Fortran compiler to link Riemann1d utility

GRHydro contains a Riemann1d utility which contains a Fotran90 main program. Unfortunately some of the libraries we link against use C++ code and the F90 compiler fails to link the executable (missing vtables, constructors etc). Since the C++ compiler cannot link the main executable either (since it does not know how to start the main Fotran program), the attached patch adds a stub main() function that calls the previous F90 code as a subroutine. Most of the changes are to the build files to make a utility that needs preprocessed C code (for CCTK_FNAME) and contains multiple object files.

Pull request is: https://bitbucket.org/einsteintoolkit/einsteinevolve/pull-request/5/grhydro-add-c-main-function-for-riemann1d/diff though given that this is a single commit I'd much rather have it be applied than to get a merge for a single commit.

Keyword: GRHydro

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