Slightly modernize C syntax #639
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Modern C compilers emit warnings like the following:
```
/Users/runner/work/elmerfem/elmerfem/fem/src/fft.c:389:6: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
void BitReverseArray( N, T )
^
```
or:
```
/Users/runner/work/elmerfem/elmerfem/fem/src/Load.c:434:22: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
return (*Function)( Model );
^
```
Slightly modernize the syntax by fully qualifying the function
prototypes.
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Modern C compilers emit warnings like the following:
or:
Slightly modernize the syntax by fully qualifying the function prototypes.