net-im/qTox: exorcise -Werror, -pedantic-errors

The build previously failed on armv7 due to a statement expression in
a dependency header, causing a deadly warning cum error.  Exorcise
-Werror and its evil cousin -pedantic-errors to fix the build.

Approved by:	portmgr (build fix blanket)
MFH:		2025Q4

(cherry picked from commit 1fdec208)