Fixed image mipmap creation on some systems with buggy video drivers

src/modules/graphics/opengl/Font.cpp

@@ -516,8 +516,6 @@ void Font::checkMipmapsCreated() const
 
 		if (GLEE_VERSION_3_0 || GLEE_ARB_framebuffer_object)
 			glGenerateMipmap(GL_TEXTURE_2D);
-		else if (GLEE_EXT_framebuffer_object)
-			glGenerateMipmapEXT(GL_TEXTURE_2D);
 		else
 		{
 			// modify single texel to trigger mipmap chain generation

src/modules/graphics/opengl/Image.cpp

@@ -169,8 +169,6 @@ void Image::checkMipmapsCreated() const
 
 		if (GLEE_VERSION_3_0 || GLEE_ARB_framebuffer_object)
 			glGenerateMipmap(GL_TEXTURE_2D);
-		else if (GLEE_EXT_framebuffer_object)
-			glGenerateMipmapEXT(GL_TEXTURE_2D);
 		else
 			// modify single texel to trigger mipmap chain generation
 			glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, data->getData());