Disable depth and stencil buffers

Disable allocation of depth and stencil buffers. This reduces active
GPU memory consumption by almost a third, at least on Linux.

CHANGELOG.md

@@ -68,6 +68,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Crash when resuming after suspension
 - Crash when trying to start on X11 with a Wayland compositor running
 - Crash with a virtual display connected on X11
+- GPU memory usage has been decreased by disabling allocation of depth and stencil buffers
 
 ### Removed
 

alacritty/src/window.rs

@@ -117,6 +117,8 @@ fn create_gl_window(
     let windowed_context = ContextBuilder::new()
         .with_srgb(srgb)
         .with_vsync(true)
+        .with_depth_buffer(0)
+        .with_stencil_buffer(0)
         .with_hardware_acceleration(None)
         .build_windowed(window, event_loop)?;