i915,i965: Don't condition use of GLSL clear on the current API

i915,i965: Don't condition use of GLSL clear on the current API

Meta always sets the API to API_OPENGL_COMPAT, so the current API
setting is irrelevant.

   text	   data	    bss	    dec	    hex	filename
7154994	 256860	  37332	7449186	 71aa62	32-bit i965_dri.so before
7154978	 256860	  37332	7449170	 71aa52	32-bit i965_dri.so after
6788451	 328056	  50704	7167211	 6d5ceb	64-bit i965_dri.so before
6788419	 328056	  50704	7167179	 6d5ccb	64-bit i965_dri.so after

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>