/usr/bin/mips64el-linux-gnuabi64-pkg-config is in pkg-config-mips64el-linux-gnuabi64 4:5.3.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../share/pkg-config-crosswrapper
/usr/bin/../share/pkg-config-crosswrapper