Add runtime dependency to spirv-tools as the qsb utility can use
spirv-opt at runtime. Cannot include it for mingw32 toolchain
as compilation fails.
To support dunfell, add BBCLASSEXTEND append to the spirv-tools.
Fixes: QTBUG-113210
Change-Id: Icce264b1f2bff5f56cf2b40a0420c5001493e236
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>
(cherry picked from commit 69a8018ec1)
