LibGL: Implement glScalef

Author: https://github.com/Quaker762
Commit: ea0df0b5da
Pull-request: https://github.com/SerenityOS/serenity/pull/6375
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/ccapitalK
Reviewed-by: https://github.com/gmta
Reviewed-by: https://github.com/sunverwerth ✅

Userland/Libraries/LibGL/SoftwareGLContext.h

@@ -29,6 +29,7 @@ public:
     virtual void gl_push_matrix() override;
     virtual void gl_pop_matrix() override;
     virtual void gl_rotate(GLdouble angle, GLdouble x, GLdouble y, GLdouble z) override;
+    virtual void gl_scale(GLdouble x, GLdouble y, GLdouble z) override;
     virtual void gl_translate(GLdouble x, GLdouble y, GLdouble z) override;
     virtual void gl_vertex(GLdouble x, GLdouble y, GLdouble z, GLdouble w) override;
     virtual void gl_viewport(GLint x, GLint y, GLsizei width, GLsizei height) override;