add more flags for C++17

Author: mikedh

build_dependencies/install_linux.sh

@@ -36,7 +36,7 @@ cd ..
 
 # Build and install octomap
 cd octomap
-$CMAKE . -D CMAKE_BUILD_TYPE=Release -D BUILD_OCTOVIS_SUBPROJECT=OFF -D BUILD_DYNAMICETD3D_SUBPROJECT=OFF -D CMAKE_CXX_STANDARD=17
+$CMAKE . -D CMAKE_BUILD_TYPE=Release -D BUILD_OCTOVIS_SUBPROJECT=OFF -D BUILD_DYNAMICETD3D_SUBPROJECT=OFF -D CMAKE_CXX_STANDARD=17 -D CMAKE_CXX_FLAGS="-std=c++17"
 make -j4
 make install
 cd ..