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/GL/gl.h

@@ -83,6 +83,7 @@ GLAPI void glMatrixMode(GLenum mode);
 GLAPI void glPushMatrix();
 GLAPI void glPopMatrix();
 GLAPI void glRotatef(GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
+GLAPI void glScalef(GLfloat x, GLfloat y, GLfloat z);
 GLAPI void glTranslatef(GLfloat x, GLfloat y, GLfloat z);
 GLAPI void glVertex3f(GLfloat x, GLfloat y, GLfloat z);
 GLAPI void glViewport(GLint x, GLint y, GLsizei width, GLsizei height);