autogen.sh: remove the ACLOCAL_FLAGS variable
autogen.sh: remove the ACLOCAL_FLAGS variable

The user can set the ACLOCAL environment variable to override
the location of the <prefix>/share/aclocal. But the assignation of
the variable ACLOCAL_FLAGS prevents the override.

This patch also pass the autogen.sh parameters to gnome-autogen.sh.

Signed-off-by: Víctor Manuel Jáquez Leal <853e0dbb5ddd43a0f0483f24794ae05c4c52af91@igalia.com>

grilofw/grilo-plugins,vrutkovs/grilo-plugins,GNOME/grilo-plugins,vrutkovs/grilo-plugins,GNOME/grilo-plugins,kyoushuu/grilo-plugins,kyoushuu/grilo-plugins,kyoushuu/grilo-plugins,vrutkovs/grilo-plugins,MathieuDuponchelle/grilo-plugins,MikePetullo/grilo-plugins,grilofw/grilo-plugins,jasuarez/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,MathieuDuponchelle/grilo-plugins,MathieuDuponchelle/grilo-plugins,MikePetullo/grilo-plugins,jasuarez/grilo-plugins,vrutkovs/grilo-plugins