xbps-src: common/{,environment}/build_style -> common/${,environment}/build-style.

common/build-style/gnu-configure.sh

@@ -0,0 +1,21 @@
+#
+# This helper is for templates using GNU configure scripts.
+#
+do_configure() {
+	: ${configure_script:=./configure}
+
+	${configure_script} ${configure_args}
+}
+
+do_build() {
+	: ${make_cmd:=make}
+
+	${make_cmd} ${makejobs} ${make_build_args} ${make_build_target}
+}
+
+do_install() {
+	: ${make_cmd:=make}
+	: ${make_install_target:=install}
+
+	${make_cmd} DESTDIR=${DESTDIR} ${make_install_args} ${make_install_target}
+}