HPCC-17029 Fix regression in standalone eclcc windows compiles

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>

rtl/eclrtl/eclinclude4.hpp

@@ -55,6 +55,10 @@ typedef unsigned short UChar;
 #ifdef _WIN32
 typedef unsigned int size32_t; // avoid pulling in platform.h (which pulls in windows.h etc) just for this...
 typedef unsigned __int64 hash64_t;
+#define DECL_EXPORT __declspec(dllexport)
+#define DECL_IMPORT __declspec(dllimport)
+#define DECL_LOCAL
+#define DECL_EXCEPTION
 #else
 #include "platform.h"
 #endif