Problem: [travis] Valgrind always installed on OSX
Problem: [travis] Valgrind always installed on OSX

Solution: install it only on the Valgrind build

paddor/zproject,zeromq/zproject,zeromq/zproject,paddor/zproject,taotetek/zproject,taotetek/zproject,paddor/zproject,zeromq/zproject,taotetek/zproject