LibGL: Implement glDrawArrays

Author: https://github.com/sunverwerth
Commit: e64d0d43d2
Pull-request: https://github.com/SerenityOS/serenity/pull/9382
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibGL/GLContext.h

@@ -69,6 +69,7 @@ public:
     virtual void gl_vertex_pointer(GLint size, GLenum type, GLsizei stride, const void* pointer) = 0;
     virtual void gl_color_pointer(GLint size, GLenum type, GLsizei stride, const void* pointer) = 0;
     virtual void gl_tex_coord_pointer(GLint size, GLenum type, GLsizei stride, const void* pointer) = 0;
+    virtual void gl_draw_arrays(GLenum mode, GLint first, GLsizei count) = 0;
 
     virtual void present() = 0;
 };