janitorial: fixing prototypes

[Eric Pouech]

fixes some error in function prototypes
there were a few cases of missing information, but most important on is that, in 
C, "void foo();", means that we don't know what foo's signature is, but doesn't 
mean, as in C++, that foo doesn't take any parameter. The correct C code is 
"void foo(void);"
A+
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