Undeclared sign function parameters without +diff

[Tom Ryder]

Hello Vim developers; attached is a patch for an issue that cropped up
for me when rebuilding Vim without +diff (FEAT_DIFF) since the recent
work on 'signcolumn'.

--
Tom Ryder <https://sanctum.geek.nz/>

[Bram Moolenaar]

Tom Ryder wrote:

> Hello Vim developers; attached is a patch for an issue that cropped up
> for me when rebuilding Vim without +diff (FEAT_DIFF) since the recent
> work on 'signcolumn'.

> The function get_sign_display_info() in screen.c includes parameters for
> integers filler_lines and filler_todo, but these are only declared and
> defined if FEAT_DIFF is defined for the +diff feature. If that feature
> is excluded, but signs are included, compilation to screen.o fails.
> This patch declares the two integers unconditionally, but defines them
> to zero later on if the feature is unavailable.

Thanks, I'll include it with a slight change.

--
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