add missing flags to conditional check

src/renderer_gl.cpp

@@ -7281,6 +7281,8 @@ namespace bgfx { namespace gl
 					 | BGFX_STATE_BLEND_MASK
 					 | BGFX_STATE_BLEND_EQUATION_MASK
 					 | BGFX_STATE_ALPHA_REF_MASK
+					 | BGFX_STATE_BLEND_ALPHA_TO_COVERAGE
+					 | BGFX_STATE_BLEND_INDEPENDENT
 					 | BGFX_STATE_PT_MASK
 					 | BGFX_STATE_POINT_SIZE_MASK
 					 | BGFX_STATE_MSAA