Move UNITY_PRINT_EOL to internals to allow access to it.

Unity fixture needs access to this macro to be consistent.
Add #ifndef wrapper for easier redefinition on systems that use "\r\n".

src/unity_internals.h

@@ -291,6 +291,10 @@ typedef UNITY_DOUBLE_TYPE _UD;
 extern int UNITY_OUTPUT_CHAR(int);
 #endif
 
+#ifndef UNITY_PRINT_EOL
+#define UNITY_PRINT_EOL       { UNITY_OUTPUT_CHAR('\n'); }
+#endif
+
 #ifndef UNITY_OUTPUT_START
 #define UNITY_OUTPUT_START()
 #endif