[PATCH] configure: combine common parts of CONFIGURE_C{,XX}FLAGS

[David Bremner]

Tomi Ollila <tomi.ollila at iki.fi> writes:

> By combining the common parts of CONFIGURE_CFLAGS and CONFIGURE_CXXFLAGS
> to a separate make variable and using that as part of their
> definitions makes setting of these easier, DRYer and less error prone
> (especially as we cannot check potential typing errors there).

pushed,

d