Work around an issue found when working with gcc3 on alpha,

gcc2 nomally calls functions thru the gp (basically a function pointer), but
gcc3 frequently calls directly to the plt. gcc2 does occasionally directly
call to the plt. Currently how the plt/pltgot is fixed up on lazy
binding, this will cause the dl_bind code to be called on each plt call
causing a symbol resolution and plt fixup. This diff works around the
problem partially by recognizing that a pltgot entry is already fixed
and skips the symbol resolution. Since the pltgot is what is modified
do not add PROT_EXEC permission to the mapping.
While this is not an ideal fix, kettenis and I think it is better than before.

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