A few fixes to make it compile under windows again

luprex/core/cpp/printbuffer.cpp

@@ -4,6 +4,7 @@
 
 #include <algorithm>
 #include <cstdio>
+#include <cinttypes>
 
 struct PrintBufferCore  : public eng::opnew {
     // The most recent lines printed.
@@ -190,7 +191,7 @@ bool PrintChanneler::channel(const PrintBuffer *printbuffer, std::ostream &ostre
 
 Invocation PrintChanneler::invocation(int64_t actor_id) {
     char buf[80];
-    sprintf(buf, "%ld", line_);
+    sprintf(buf, PRId64, line_);
     return Invocation(Invocation::KIND_FLUSH_PRINTS, actor_id, actor_id, buf, InvocationData());
 }