Fix compile problems appearing with the updated release

examples/C/src/ReflexGame/ReflexGame.lf

@@ -13,10 +13,6 @@ target C {
   keepalive: true
 }
 
-preamble {=
-  #include "include/core/platform.h"
-=}
-
 /**
  * Produce a counting sequence at random times with a minimum and maximum time between outputs
  * specified as parameters.

examples/C/src/distributed/HelloWorld.lf

@@ -38,10 +38,14 @@ reactor MessageGenerator(prefix: string = "") {
     // With NULL, 0 arguments, snprintf tells us how many bytes are needed.
     // Add one for the null terminator.
     int length = snprintf(NULL, 0, "%s %d", self->prefix, self->count) + 1;
+
     // Dynamically allocate memory for the output.
-    SET_NEW_ARRAY(message, length);
+    char* buffer = malloc(length);
+
     // Populate the output string and increment the count.
-    snprintf(message->value, length, "%s %d", self->prefix, self->count++);
+    snprintf(buffer, length, "%s %d", self->prefix, self->count++);
+
+    lf_set_array(message, buffer, length);
 
     tag_t tag = lf_tag();
     lf_print("At (elapsed) logical tag (%lld, %u), source sends message: %s",