Added build_style and cross-profiles dirs from xbps-src.

common/build_style/waf.sh

@@ -0,0 +1,16 @@
+#
+# This helper is for templates using WAF to build/install.
+#
+do_configure() {
+	python waf configure --prefix=/usr ${configure_args}
+}
+
+do_build() {
+	python waf build ${make_build_args}
+}
+
+do_install() {
+	make_install_args+=" --destdir=${DESTDIR}"
+
+	python waf install ${make_install_args}
+}