Add initial make infrastructure

bench/config.mk

@@ -0,0 +1,5 @@
+BENCH_SOURCES = $(wildcard $(ATRIP_ROOT)/bench/test*.cxx)
+BENCH_TARGETS = $(patsubst %.cxx,%,$(BENCH_SOURCES))
+
+bench-clean:
+	-rm -v $(BENCH_TARGETS)

bench/test_main.cxx

@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+  std::cout << "Hello world" << std::endl;
+  return 0;
+}