LibGL+LibGPU: Implement glPointSize

Author: https://github.com/gmta
Commit: 0dcb23ee96
Pull-request: https://github.com/SerenityOS/serenity/pull/13970
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/sunverwerth ✅

Userland/Libraries/LibGPU/RasterizerOptions.h

@@ -38,6 +38,7 @@ struct RasterizerOptions {
     bool fog_enabled { false };
     float fog_start { 0.0f };
     float fog_end { 1.0f };
+    float point_size { 1.f };
     bool scissor_enabled { false };
     bool normalization_enabled { false };
     Gfx::IntRect scissor_box;