[PATCH] configure: Use -Wimplicit-function-declaration if possible.

[Dean Greer]

Signed-off-by: Dean M Greer <gcenx83 at gmail.com>
---
Here’s the information on this change if needed, some of the recent patches
from Zebediah and Alistair have been to resolve issues related to this.

Wine-Staging now builds wine-devel and wine-staging on each rebase for
macOS using GitHub actions.

# Xcode12 by default enables '-Werror,-Wimplicit-function-declaration'
(49917738)
#
https://developer.apple.com/documentation/xcode-release-notes/xcode-12-release-notes
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