ladish: use custom do_configure to avoid configure_args.

srcpkgs/ladish/template

@@ -4,7 +4,6 @@ version=1
 revision=6
 wrksrc="ladish-1+dfsg0"
 build_style=waf
-configure_args="--enable-liblash --enable-pylash"
 hostmakedepends="perl intltool python pkg-config"
 makedepends="python-devel alsa-lib-devel jack-devel
  dbus-devel dbus-glib-devel libuuid-devel expat-devel glib-devel gtk+-devel
@@ -18,6 +17,10 @@ homepage="http://ladish.org"
 distfiles="http://ftp.de.debian.org/debian/pool/main/l/ladish/ladish_1+dfsg0.orig.tar.bz2"
 checksum=39b09d5a4c2f2d65d37374eb8b53f35039f2229d96ea6ddef7b1ce154403383a
 
+do_configure() {
+	python waf configure --prefix=/usr --enable-liblash --enable-pylash
+}
+
 ladish-devel_package() {
 	depends="libuuid-devel ladish>=${version}_${revision}"
 	short_desc+=" - development files"