[hppa-hpux] Fix passing function pointers into dummy call

[Randolph Chung]

hppa is one of the platforms that uses function descriptors. When 
calling an inferior function from gdb and passing a function pointer, we 
need to make sure that we are passing the function descriptor address 
instead of the function entry point. Fix this case for hppa64-*

This fixes all the interesting cases in callfuncs.exp, including two 
tests that were marked kfail.

note that for hppa-*, we do not need to worry about this because the 
compiler puts in additional code to handle this at runtime.

I'll check this in over the weekend if there are no comments. (at that 
point i'll remove the kfails as well)

randolph
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