RFC: fix configure spewage from PKG_CHECK_MODULES and others.

[Andreas Köhler]

Hi,

> As for aclocal preferring our macros: That is simply a question of the 
> "-I bla -I foo" arguments to "aclocal". Currently the highest priority 
> is given to the user's ACLOCAL_FLAGS (including directories from 
> GNOME2_PATH), second highest to our local macros/ directory, last 
> priority the standard aclocal directory. So as long as neither 
> ACLOCAL_FLAGS nor GNOME2_PATH is set, our macros are guaranteed to be used.

Would not it be better to switch the priorities in autogen.sh to "-I
macros -I ${ACLOCAL_FLAGS}"? That way aclocal will really use the
macro GnuCash wants it to do. People needing another behavoir can
make local adjustments to force that. Btw, I am currently testing in
an environment which has ACLOCAL_FLAGS set and interesing macros
therein.

-- andi5