glsl: Treat sampler2DRect and sampler2DRectShadow as reserved in ES2

"sampler2DRect" and "sampler2DRectShadow" are specified as
reserved from GLSL 1.1 and GLSL ES 1.0

Signed-off-by: zhaowei yuan <zhaowei.yuan@samsung.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106906


Reviewed-by: Eric Anholt <eric@anholt.net>
Fixes: 34f7e761 ("glsl/parser: Track built-in types using the glsl_type directly")
(cherry picked from commit 73ec4376)