[vorbis] portab.h warning when compiling

[.joj]

It doen't seem to be anyting seriuos but I get this when crosscompiling not otherwise.

  

<p><p>               from ../../src/bitstream/bitstream.c:57:
../../src/bitstream/../portab.h:61: warning: `ARCH_IS_32BIT' redefined
*Initialization*:1: warning: this is the location of the previous definition

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