PR#252928 mtools needs iconv and mtools.conf edit for ipxe to compile

[John Kennedy]

  Can someone take a look at bug # 252928?


  I don't guarantee that it is anywhere near the right thing to do, but my
general issues trying to compile net/ipxe are:

	net/ipxe requires mformat from emultators/mtools
	When mtools is built, it gets libiconv loaded because of texinfo
	The port Makefile didn't have it configured as a prerequisite, so when
		the option is used (default on), it configures itself for it
		and when ipxe pulls it in, the shared library is missing
	mtools installs mtools.conf with a line you're supposed to
		uncomment, but in a clean poudriere build there is no
		way to do that