add a hello.c examples w/ binaries

hello/Makefile

@@ -0,0 +1,13 @@
+.FAKE: all clean test
+
+all: hello
+
+clean:
+	rm -f hello
+
+hello: hello.c
+	musl-gcc -static -O2 -o hello hello.c
+
+test: hello
+	./hello
+

hello/hello.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(int argc, const char **argv) {
+	puts("Hello, world!\n");
+	return 0;
+}
+