[ob] -Wmissing-prototypes step 1

[Andrew Cagney]

Hello,

This fixes a heap of -Wmissing-prototypes warnings and in doing so 
identified two problems:

- function definitions that forgot to include the header file containing 
the declarationc (doh!)

- non-static functions having no header declaration, instead the call 
relies on an extern declaration in the calling .c file (outch!)

Given this, I think the warning is very useful.

Since this only cleans up the d10v-elf target, adding 
-Wmissing-prototypes to the default warning list should probably wait a bit.

committed,
Andrew
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