Fix epiphany libgloss for c99/gcc-14

So in this case we mostly need to include an internal header
(epiphany-syscalls.h).  In a few cases an explicit prototype is added.  We've
also got a return with no value in a function with a non-void return type.
Finally the asm_syscall interface expects a pointer as its first argument.  In
a few cases we've actually got an int (file descriptor) which we just cast to a
void *.

It's slightly more than Jeff J's pre-approval, but I think still reasonable.

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