Add a pretty simple test program

tests/1/.ninja_log

@@ -0,0 +1,3 @@
+# ninja log v5
+0	0	1683492538462869278	main	6157dd645b7b0062
+0	0	1683492538462869278	main-static	92a52c8bbfaceaad

tests/1/build.ninja

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+cxxflags = -Wall -fuse-ld=lld --sysroot /sysroot
+
+rule cc
+  command = clang++ $cxxflags -c $in -o $out
+
+rule static-cc
+  command = clang++ $cxxflags -c $in -o $out
+
+build main: cc main.cpp
+build main-static: static-cc main.cpp

tests/1/main.cpp

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+#include <stdio.h>
+#include <string>
+#include <memory>
+#include <iostream>
+
+int main() {
+  auto a = std::make_unique<std::string>("boooo");
+  printf("test_1\n");
+  std::cout << *a << "\n";
+  return 0;
+}