[PATCH v2 7/7] Enable -Wmissing-declarations diagnostic

[Simon Marchi]

On 2020-01-10 5:00 p.m., Simon Marchi wrote:
> Now that most warnings of this kind are fixed, we can enable
> -Wmissing-declarations.  I say "most", because it is likely that there
> are some more in some configurations I am not able to build, but they
> should be pretty easy to fix.
> 
> gdb/ChangeLog:
> 
> 	* warning.m4: Add -Wmissing-declarations to build_warnings.
> 	* configure: Re-generate.

This is missing the ChangeLog entry for gdbserver, I've updated
it locally.

Simon