Remove OES_depth24 and EXT_multisampled_render_to_texture from extension list.

Added as is, they break ABI of al_get_opengl_extension_list. You can still
check their presence via al_have_opengl_extension.

Author: SiegeLordEx

include/allegro5/opengl/GLext/gl_ext_list.h

@@ -280,11 +280,9 @@ AGL_EXT(OES_read_format,               0)
 AGL_EXT(OES_query_matrix,              0)
 AGL_EXT(OES_framebuffer_object,        0)
 AGL_EXT(OES_texture_npot,              0)
-AGL_EXT(OES_depth24,                   0)
 AGL_EXT(EXT_depth_bounds_test,         0)
 AGL_EXT(EXT_texture_mirror_clamp,      0)
 AGL_EXT(EXT_blend_equation_separate,   0)
-AGL_EXT(EXT_multisampled_render_to_texture, 0)
 AGL_EXT(MESA_pack_invert,              0)
 AGL_EXT(MESA_ycbcr_texture,            0)
 AGL_EXT(EXT_pixel_buffer_object,       0)