glamor: prefer to use bgra textures for OpenGL ES

xserver uses PICT_x8r8g8b8 and PICT_a8r8g8b8 as a default formats for 24 and 32 bit depth pictures. For these picture formats we need to use GL_BGRA texture formats. In OpenGL ES 2.0 GL_BGRA formats are present only with GL_EXT_texture_format_BGRA8888.

Signed-off-by: Yuriy Vasilev <uuvasiliev@yandex.ru>
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