Log Message: math/z3: make this build on NetBSD/macppc 9.99.99. Fixes two issues: * <immintrin.h> is only available on amd64 and i386 (I think...) * The scanner depends on signed chars a number of places. Sprinkle "signed" a minimal set of places to make this explicit, to deal with powerpc where "char" == "unsigned char". Bump PKGREVISION.