Use Debug instead of Release to increase build time (passing -O0)

CI/before_script.osx.sh

@@ -15,7 +15,7 @@ cmake \
 -D CMAKE_CXX_COMPILER_LAUNCHER="$CCACHE_EXECUTABLE" \
 -D CMAKE_CXX_FLAGS="-std=c++11 -stdlib=libc++" \
 -D CMAKE_OSX_DEPLOYMENT_TARGET="10.9" \
--D CMAKE_BUILD_TYPE=Release \
+-D CMAKE_BUILD_TYPE=DEBUG \
 -D OPENMW_OSX_DEPLOYMENT=TRUE \
 -D BUILD_ESMTOOL=FALSE \
 -G"Unix Makefiles" \