Remove dependency to D runtime in mixed language tests
It is undefined behaviour to call D I/O functions without initializing D runtime first. Simplify the test so it will work in all platforms.
-import std.stdio;
+import core.stdc.stdio;
extern (C++) void print_hello(int i) {
- writefln("Hello. Here is a number printed with D: %d", i);
+ printf("Hello. Here is a number printed with D: %d\n", i);
}
