add_headers is a noop in ExtUtils::Depends >= 0.2, and doesn't do anything useful that install doesn't do in < 0.2, so take it out.  this avoids some noise on stderr as well.
add_headers is a noop in ExtUtils::Depends >= 0.2, and doesn't do anything
useful that install doesn't do in < 0.2, so take it out.  this avoids some
noise on stderr as well.

svn path=/trunk/; revision=509

potyl/perl-Glib,potyl/perl-Glib,potyl/perl-Glib