$make_check_pre can be used for wrapper commands like xvfb-run or
dbus-run-session which are common ways to make tests work. This way many
templates can avoid defining their own do_check function.
libtool will insert RPATH if $libdir not in sys_lib_dlsearch_path_spec.
libtool's configure will parse /etc/ld.so.conf for this value.
Without this change the original value is:
- glibc: /lib /usr/lib /usr/lib32 /usr/local/lib
- musl: /lib /usr/lib