[gccgo] Fix portability issues for Mac OS PPC

[Ian Lance Taylor]

This patch fixes a couple of issues building gccgo for Mac OS PPC.
First, avoid a warning about an unused variable when
ADJUST_FIELD_ALIGN does not use the field.  Second, don't use the
glibc function getline.  I just wrote my own version of the latter.
Committed to gccgo branch.

Ian


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