Add libc-free hello_world

resources/examples/nolibc/hello_world.c3

@@ -0,0 +1,22 @@
+fn int main()
+{
+    String msg = "Hello, C3 World!\n";
+    $$syscall(1, 1, (uptr)msg.ptr, msg.len); // __NR_write, STDOUT
+    return 0;
+}
+
+fn void _start() @export("_start")
+{
+    int ret = main();
+    $$syscall(60, ret); // __NR_exit
+}
+
+module std::core::builtin;
+
+def PanicFn = fn void(String message, String file, String function, uint line);
+
+PanicFn panic = &default_panic;
+
+fn void default_panic(String message, String file, String function, uint line)
+{
+}

resources/examples/nolibc/project.json

@@ -0,0 +1,21 @@
+{
+  "authors": [ "Dmitry Atamanov https://github.com/data-man" ],
+  "version": "0.0.1 Omega",
+  "sources": [ "./**" ],
+  "targets": {
+    "hello_world": {
+      "type": "executable",
+      "opt": "O3",
+      "nolibc": true,
+      "nostdlib": true
+    },
+  },
+  "debug-info": "none",
+  "target": "linux-x64",
+  "reloc": "none",
+  "trap-on-wrap": false,
+  "soft-float": false,
+  "x86vec": "sse",
+  "cpu": "generic",
+  "output": "."
+}