Rework how proper ABI flags are set on IRIX, using patch provided by

Georg Schwarz in PR pkg/25057:

- check for PKGSRC_COMPILER instead of USE_MIPSPRO:
  USE_MIPSPRO would imply the former, but not the other way around.
  That is, it's conceivable to have a system that has PKGSRC_COMPILER
  set (to mipspro), but not USE_MIPSPRO.

- Allow passing of -Duse64bitint if ABI == 64 even if the compiler is not
  mipspro.  (Note: we could test this on a non-IRIX 64bit platform by
  setting ABI to '64'.  I think that should work, too, but I can't test
  that right now.)

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