If the rationale (and that's a big if) for using make
and not emake was parallelism, we should be using -j1,
not 'make' which won't respect ${MAKE} or other ${MAKEOPTS}.
While at it, clean up a stale/misplaced comment in
src_install too (makes no sense where it is,
presumably 'make' was previously used in src_install
or -j1 was forced in the past).
Signed-off-by: Sam James <sam@gentoo.org>