In #15037, I modified the build script of libgsasl to enable GSSAPI, but it is still wrong, because the PATH does not include the `thirdparty/installed/bin`, so when building libgsasl, it will report error: `WARNING: MIT Kerberos krb5-config not found, disabling GSSAPI` but `krb5-config` is in `thirdparty/installed/bin`. Without GSSAPI, the libhdfs3 can not access hdfs with kerberos authentication.