Use android::base::Basename instead of basename

basename can have different behavior based on whether the glibc
or posix version is used, and musl doens't provide the glibc version
at all.  Avoid the problem by using the one in libbase instead.

Test: m USE_HOST_MUSL=true host-native -k
Change-Id: If17c7622ed9b9cffc218567a46afb059b608d3c9