Add an include to ease Sloeber plugin usage

Sloeber/arduino-eclipse-plugin#1143

Thanks @jantje

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/Arduino.h

@@ -29,6 +29,10 @@
 #error "GCC version 6.3 or higher is required"
 #endif
 
+#ifdef __IN_ECLIPSE__
+#include "SrcWrapper.h"
+#endif
+
 #include "wiring.h"
 
 /* sketch */