ppp: Update to version 2.4.9

ppp: Update to version 2.4.9

Upstream integrated multiple patches from Distributions and did other
changes:
* rp-pppoe.so was renamed to pppoe.so
* Converted to ANSI C

The following patches were applied upstream:
* 100-debian_ip-ip_option.patch
* 101-debian_close_dev_ppp.patch
* 103-debian_fix_link_pidfile.patch
* 106-debian_stripMSdomain.patch
* 107-debian_pppoatm_wildcard.patch
* 110-debian_defaultroute.patch
* 202-no_strip.patch

Compilation with musl libc was fixed upstream so
140-pppoe_compile_fix.patch is not needed any more

Parts of the 203-opt_flags.patch patch were applied in a different way
upstream.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>