handle CPPFLAGS in configure and make

[Tomi Ollila]

On Sun, May 26 2013, david at tethera.net wrote:

> I wanted to enable hardening flags in the debian build (I guess other
> distros will want to do the same); I realized this is made more
> difficult by the fact that we don't handle CPPFLAGS in our build
> system. Well, if it makes us feel any better, CMake had (has?) the
> same bug.

Series LGTM. I don't know what V=1 does but probably nothing harmful :D

Tomi

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