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[gfortran, patch] Fix -ff2c type mismatches



f2c calling conventions require that a scalar default REAL function actually returns the C type double. Our current implementation makes the function symbol's backend_decl of type double, which in the case of no explicit RESULT variable leads to all kinds of type mismatches. This patch fixes this, by only making the function REAL*8, not the RESULT variable, and then converting the result variable to REAL*8 when passing it to the function result.


Built and tested on i386-darwin, this passes the testsuite except for the failures which are due to PR29516. Ok?

Cheers,
- Tobi


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