connman: Move ppp from DEPENDS to PACKAGECONFIG

ppp is only required by connman when building the L2TP or PPTP plugins. Move it
from DEPENDS to PACKAGECONFIG so it's only there when required.

(From OE-Core rev: c65180bb677d8dae1992445cd378119d8cbed424)

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/connman/connman_1.44.bb

@@ -16,7 +16,7 @@ inherit autotools pkgconfig systemd update-rc.d update-alternatives
 
 CVE_PRODUCT = "connman connection_manager"
 
-DEPENDS  = "dbus glib-2.0 ppp"
+DEPENDS  = "dbus glib-2.0"
 
 SRC_URI = "${KERNELORG_MIRROR}/linux/network/${BPN}/${BP}.tar.xz \
            file://0001-connman.service-stop-systemd-resolved-when-we-use-co.patch \
@@ -63,8 +63,8 @@ PACKAGECONFIG[iwd] = "--enable-iwd,--disable-iwd,,iwd"
 PACKAGECONFIG[tist] = "--enable-tist,--disable-tist,"
 PACKAGECONFIG[openvpn] = "--enable-openvpn --with-openvpn=${sbindir}/openvpn,--disable-openvpn,,openvpn"
 PACKAGECONFIG[vpnc] = "--enable-vpnc --with-vpnc=${sbindir}/vpnc,--disable-vpnc,,vpnc"
-PACKAGECONFIG[l2tp] = "--enable-l2tp --with-l2tp=${sbindir}/xl2tpd,--disable-l2tp,,xl2tpd"
-PACKAGECONFIG[pptp] = "--enable-pptp --with-pptp=${sbindir}/pptp,--disable-pptp,,pptp-linux"
+PACKAGECONFIG[l2tp] = "--enable-l2tp --with-l2tp=${sbindir}/xl2tpd,--disable-l2tp,ppp,xl2tpd"
+PACKAGECONFIG[pptp] = "--enable-pptp --with-pptp=${sbindir}/pptp,--disable-pptp,ppp,pptp-linux"
 # WISPr support for logging into hotspots, requires TLS
 PACKAGECONFIG[wispr] = "--enable-wispr,--disable-wispr,gnutls,"
 PACKAGECONFIG[nftables] = "--with-firewall=nftables ,,libmnl libnftnl,,kernel-module-nf-tables kernel-module-nft-chain-nat-ipv4 kernel-module-nft-chain-route-ipv4 kernel-module-nft-masq-ipv4 kernel-module-nft-nat"