fix travis

.travis/build-mac.bash

@@ -1,4 +1,3 @@
-brew install ccache glew ninja qt
 export CCACHE_SLOPPINESS=pch_defines,time_macros
 export CMAKE_PREFIX_PATH=/usr/local/opt/qt5/
 export PATH="/usr/local/opt/ccache/libexec:$PATH"
@@ -10,7 +9,7 @@ sudo perl -pi -e 'BEGIN{undef $/;} s/(_LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS[
 # Setup vulkan and gfx-rs/portability
 curl -sLO https://github.com/gfx-rs/portability/releases/download/latest/gfx-portability-macos-latest.zip
 unzip -: gfx-portability-macos-latest.zip
-curl -sLO https://github.com/KhronosGroup/Vulkan-Headers/archive/sdk-1.1.85.0.zip
+curl -sLO https://github.com/KhronosGroup/Vulkan-Headers/archive/sdk-1.1.92.0.zip
 unzip -: sdk-*.zip
 mkdir vulkan-sdk
 ln -s ${PWD}/Vulkan-Headers*/include vulkan-sdk/include