[macOS, CI] Update dependencies, don't use lz4 from Homebrew

Also, enable double precision support for Bullet.

CI/before_install.osx.sh

@@ -5,8 +5,5 @@ command -v ccache >/dev/null 2>&1 || brew install ccache
 command -v cmake >/dev/null 2>&1 || brew install cmake
 command -v qmake >/dev/null 2>&1 || brew install qt
 
-brew link --overwrite lz4  #  overwrite system lz4; use brew
-brew reinstall lz4
-
-curl -fSL -R -J https://downloads.openmw.org/osx/dependencies/openmw-deps-ef2462c.zip -o ~/openmw-deps.zip
+curl -fSL -R -J https://downloads.openmw.org/osx/dependencies/openmw-deps-f8918dd.zip -o ~/openmw-deps.zip
 unzip -o ~/openmw-deps.zip -d /private/tmp/openmw-deps > /dev/null

CI/before_script.osx.sh

@@ -25,5 +25,6 @@ cmake \
 -D BUILD_BSATOOL=TRUE \
 -D BUILD_ESSIMPORTER=TRUE \
 -D BUILD_NIFTEST=TRUE \
+-D BULLET_USE_DOUBLES=TRUE \
 -G"Unix Makefiles" \
 ..