[ppc32]: LEA() incompatible with secure_plt

[Felix Janda]

Hello,

LEA() in mpn/powerpc32/elf.m4 uses an idiom to obtain a pointer to the
GOT which is incompatible with the newer secure_plt linking model for
powerpc and makes binutils fall back to the older bss-plt (with rwx
PLT and GOT). See

http://sources.redhat.com/ml/binutils/2005-05/msg00391.html
http://www.sourceware.org/ml/binutils/2005-05/txt00011.txt

The attached patch (should still apply to the current version) uses
the idea from the second link to make LEA() work without an executable
GOT.

Felix
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