illumos gate

on SPARC, a modstub for getfstype() is declared, despite getfstype() being static and thus only called from swapgeneric.

Since getfstype is static, external callers should not exist, and again because it is static the presence of the modstub causes problems and confusion for GCC4.

I believe that the modstub is unnecessary. I had entertained the theory that perhaps it existed to allow for compatibility, where non-swapgeneric callers of getfstype() perhaps previously existed. I now believe that this is unlikely, as getfstype() is, also, where boot -a is implemented. External callers are unlikely to be intending to prompt the user again, and thus should any caller exist (unlikely) they're also doing something very wrong.

In short, we should drop the getfstype modstub on SPARC (a stub on x86 does not exist).