Ports: Disable gettext support for libiconv

libiconv and gettext have a circular dependency. In an ideal world we'd
build libiconv without gettext support first, then gettext and finally
libiconv again with gettext support.

However, if the libiconv port detects gettext on the host system while
the gettext port hasn't been built yet things break.

This disables gettext support for the libiconv port for now.

Ports/libiconv/package.sh

@@ -2,7 +2,7 @@
 port=libiconv
 version=1.16
 useconfigure=true
-configopts=--enable-shared
+configopts="--enable-shared --disable-nls"
 files="https://ftpmirror.gnu.org/gnu/libiconv/libiconv-${version}.tar.gz libiconv-${version}.tar.gz
 https://ftpmirror.gnu.org/gnu/libiconv/libiconv-${version}.tar.gz.sig libiconv-${version}.tar.gz.sig
 https://ftpmirror.gnu.org/gnu/gnu-keyring.gpg gnu-keyring.gpg"