redefine DPRINT macro

Set DPRINT macro to printf by default. Long term this should be in an
os-abstraction layer but currently that would only include this macro.

Also fix an instance of invalid DPRINT usage.

Fix #57

soes/esc_eoe.c

@@ -790,8 +790,7 @@ static void EOE_receive_fragment (void)
    }
    else
    {
-      DPRINT("Size of data exceed available buffer size\n",
-            EOEvar.rxframeoffset);
+      DPRINT("Size of data exceed available buffer size\n");
       EOE_init_rx ();
       return;
    }

soes/include/sys/gcc/cc.h

@@ -70,11 +70,16 @@ extern "C"
 #endif
 
 #ifdef ESC_DEBUG
+#ifdef __rtk__
 #include <rprint.h>
-#define DPRINT(...) rprintp ("soes: "__VA_ARGS__) /* TODO */
+#define DPRINT(...) rprintp ("soes: "__VA_ARGS__)
+#else
+#include <stdio.h>
+#define DPRINT(...) printf ("soes: "__VA_ARGS__)
+#endif
 #else
 #define DPRINT(...)
-#endif  /* DEBUG */
+#endif
 
 #ifdef __cplusplus
 }