ecl.h: guard PX4 defines with ifdef

ecl.h

@@ -38,6 +38,8 @@
  */
 #pragma once
 
+#if defined(__PX4_POSIX) || defined(__PX4_NUTTX)
+
 #include <drivers/drv_hrt.h>
 #include <px4_log.h>
 
@@ -46,3 +48,11 @@
 #define ECL_INFO PX4_INFO
 #define ECL_WARN PX4_WARN
 #define ECL_ERR	 PX4_ERR
+
+#else
+
+#define ECL_INFO printf
+#define ECL_WARN printf
+#define ECL_ERR printf
+
+#endif