ole32: simplify repeated win64 checks

[Dan Kegel]

This avoids the compiler warnings:

usrmarshal.c: In function ‘HGLOBAL_UserUnmarshal’:
usrmarshal.c:485: error: logical ‘&&’ with non-zero constant will
always evaluate as true
usrmarshal.c: In function ‘HMETAFILE_UserUnmarshal’:
usrmarshal.c:1098: error: logical ‘&&’ with non-zero constant will
always evaluate as true
usrmarshal.c: In function ‘HENHMETAFILE_UserUnmarshal’:
usrmarshal.c:1290: error: logical ‘&&’ with non-zero constant will
always evaluate as true

With this and the other two similar patches I just posted,
   CFLAGS="-g -O0 -Werror" ./configure
   make
succeeds for me without regressions on a 32 bit ubuntu 10.10 system.
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