Compile with CPPFLAGS and LDFLAGS and append, rather than overwrite, CFLAGS.
This enables the Debian package to be built with hardening options. See
https://wiki.debian.org/Hardening.
When the download speed is too high, wmppp can't display it because it has
only 5 digit. The most significant digits are hidden !
This small patch display the speed in K when it is too high.
Based on the patch by jguiton <jguiton@free.fr>.
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=328699.
Users of ISDN dialup lines (such as me) cannot use wmppp as shipped,
because it rejects to use any device except those beginning with `ppp'.
The patch attached solves this.
Based on the patch by Juan Cespedes <cespedes@debian.org>.
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=97509.
