Makefile.am: swap order of args to sed
Makefile.am: swap order of args to sed

This is necessary for building on my system; otherwise sed always fails with an error.

hvr/jhc,shinnya/jhc-mirror,shinnya/jhc-mirror,hvr/jhc,shinnya/jhc-mirror,hvr/jhc,hvr/jhc,shinnya/jhc-mirror