[Lightning] Patch for PPC-32

[Laurent Michel]

Good morning Paolo,

I attach below a patch containing two bug fixes for PPC. 

1) The first is related to a compilation problem with a recent gcc version. Fixed by simply adding more casting.

2) The macros for push/pop on PPC were using incorrect offsets. 

patch-ppc32
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PS/The x86_64 works great for me now! With the patches sent in the past weeks, everything works!

--

  Laurent

smime.p7s
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