OSKI support

Example compile magic:

clang -Ioski/include -DUSE_OSKI -g -O2 -fvectorize -DTEST_ALM -fvectorize -W -Wall */*.c *.c -Wl,-rpath -Wl,oski/lib/oski/ -Loski/lib/oski `cat oski/lib/oski/site-modules-shared.txt`