libgda: needs (may need) automake

Also set python version to 3. Reference:
https://mail.gnome.org/archives/commits-list/2019-November/msg07519.html

srcpkgs/libgda/template

@@ -6,7 +6,7 @@ build_style=gnu-configure
 build_helper="gir"
 configure_args="--with-ui --with-gtksourceview --with-graphviz --enable-json
  --enable-system-sqlite"
-hostmakedepends="pkg-config intltool itstool flex perl glib-devel recode"
+hostmakedepends="automake pkg-config intltool itstool flex perl glib-devel recode"
 makedepends="gtk+3-devel libxml2-devel libxslt-devel
  libressl-devel libgcrypt-devel sqlite-devel db-devel libsoup-devel
  libsecret-devel libgnome-keyring-devel gtksourceview-devel graphviz-devel
@@ -18,7 +18,7 @@ license="GPL-2.0-only"
 homepage="http://www.gnome-db.org/"
 distfiles="${GNOME_SITE}/${pkgname}/${version%.*}/${pkgname}-${version}.tar.xz"
 checksum=59caed8ca72b1ac6437c9844f0677f8a296d52cfd1c0049116026abfb1d87d9b
-python_version=2 #unverified
+python_version=3
 
 if [ "$CROSS_BUILD" ]; then
 	configure_args+=" --disable-binreloc"