[gtkada] [GtkAda-2.2] Configure --exec-prefix option doesn't work

[Arnaud Charlet]

> I compiled GtkAda-2.0 and GtkAda-2.2 in a GNU stow environment for 
> i686-pc-linux-gnu, sparc-sun-solaris2.7 and sparc-sun-solaris2.8
> (with autoconf 2.56, automake 1.7.1, libtool 1.4.3).
> 
> The configure line was:
>      ./configure \
>      --prefix=${SHOP_STOW}/${SHOP_PACKAGE} \
>      --exec-prefix=${SHOP_STOW}/${SHOP_PACKAGE}/${SHOP_CONFIG}

Right, --exec-prefix is currently ignored by gtkada.
Patches to support this are of course welcome if they are simple and
do not break other configurations.

Arno