Can't build on iMac x32

[coolfrik]

MemXOR.cpp:94:11: error: assigning to 'const u32 *__restrict' (aka
'const unsigned int *__restrict') from incompatible type 'u64 *' (aka
'unsigned long long *') input_w = (u64 * CAT_RESTRICT)in_block;

Add #ifdef CAT_WORD_64 preprocessor directive for some lines in MemXOR.cpp.
MemXOR.zip