meta: Silence unused parameter warning in setup_drawpix_texture

meta: Silence unused parameter warning in setup_drawpix_texture

drivers/common/meta.c: In function 'setup_drawpix_texture':
drivers/common/meta.c:1572:30: warning: unused parameter 'texIntFormat' [-Wunused-parameter]

setup_drawpix_texture has never used this paramater.  Before the
refactor commit 04f8193aa it was used in several locations.  After that
commit, texIntFormat was only used in alloc_texture.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>