[gfortran, patch] Fix -ff2c type mismatches

[Tobias Schlüter]

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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