dhcpcd support broken

[Joakim Tjernlund <joakim tjernlund transmode se>]

This commit seems have broken dhcpcd support:
http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/configure.ac?h=nm-1
-0&id=7daf63461de4195b1626ca15f835fc7cbc56e847


 $ ./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man -
-infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency
-tracking --disable-silent-rules --libdir=/usr/lib64 --docdir=/usr/share/doc/networkmanager-1.0.2 --disable
-maintainer-mode --disable-gtk-doc --disable-more-warnings --disable-static --localstatedir=/var --disable-lto
--disable-config-plugin-ibft --disable-ifnet --without-netconfig --with-dbus-sys-dir=/etc/dbus-1/system.d -
-with-udev-dir=/lib/udev --with-config-plugins-default=keyfile --with-iptables=/sbin/iptables --with
-libsoup=yes --enable-concheck --with-crypto=gnutls --with-session-tracking=consolekit --with-suspend
-resume=upower --enable-bluez5-dun --enable-introspection --enable-ppp --disable-wimax --without-dhclient -
-with-dhcpcd --without-modem-manager-1 --with-nmtui --with-resolvconf --without-selinux --disable-teamdctl -
-disable-tests --enable-vala --without-valgrind --with-wext --with-pppd-plugin-dir=/usr/lib64/pppd/2.4.7

....

configure:23483: checking for dhcpcd
configure:23502: found /sbin/dhcpcd
configure:23514: result: /sbin/dhcpcd
configure:23528: WARNING: Cannot use dhcpcd, version 4.x or higher is required
configure:23540: WARNING: Could not find a suitable DHCP client, falling back to dhclient