added target aarch64, ppc64lw and s390x to TravisCI
added target aarch64, ppc64lw and s390x to TravisCI

more portability tests

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso