After a look with a fellow Crystal Space core dev, we find that
i915_emit_texld() is local to the driver with the following amount of
instances in the Mesa-7.0.3-rc2.orig i915 driver.

Mesa-7.0.3-rc2/src/mesa/drivers/dri/i915/i915_program.c:197
Mesa-7.0.3-rc2/src/mesa/drivers/dri/i915/i915_program.c:217
Mesa-7.0.3-rc2/src/mesa/drivers/dri/i915/i915_fragprog.c:214                    
 
Mesa-7.0.3-rc2/src/mesa/drivers/dri/i915/i915_fragprog.c:417
Mesa-7.0.3-rc2/src/mesa/drivers/dri/i915/i915_program.h:112
Mesa-7.0.3-rc2/src/mesa/drivers/dri/i915/i915_texprog.c:72

Being purely local it has no wider affect than the driver it is in and
thus has no wide ABI implications.

The caveat here is that the i915tex driver also uses i915_emit_texld()'s
locally and any issue or need for that to be looked at and maybe updated
is a decision for the Ubuntu X team. Though... not being the default
driver I would personally steer away from touching it until such a time
it was necessary.

-- 
Intel i915 cannot swizzle TEX arguments
https://bugs.launchpad.net/bugs/283175
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