Update with Ryan's package list

BUILDING.md

@@ -46,12 +46,20 @@ Open the build\win32\OPENXR.sln in the Visual Studio to build the samples.
 
 ## Linux
 
-The following packages are required, at minimum.
+The following set of packages provides all required libs for building for xlib or xcb with OpenGL and Vulkan support.
+ - build-essential
  - cmake (of _somewhat_ recent vintage, 3.10+ known working)
- - libx11-dev
- - libxxf86vm-dev
+ - libgl1-mesa-dev
+ - libvulkan-dev
+ - libx11-xcb-dev
+ - libxcb-dri2-0-dev
+ - libxcb-glx0-dev
+ - libxcb-icccm4-dev
+ - libxcb-keysyms1-dev
+ - libxcb-randr0-dev
  - libxrandr-dev
- - freeglut3-dev (or another way to support -lGL in ld)
+ - libxxf86vm-dev
+ - mesa-common-dev
 
 ### Linux Debug