testsuites: Move include for C++ compatibility

testsuites/support/include/tmacros.h

@@ -25,11 +25,12 @@
 #include <rtems/test.h>
 #include <rtems/score/threaddispatch.h>
 
+#include <buffer_test_io.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-
 #define FOREVER 1                  /* infinite loop */
 
 #ifdef CONFIGURE_INIT
@@ -38,8 +39,6 @@ extern "C" {
 #define TEST_EXTERN extern
 #endif
 
-#include <buffer_test_io.h>
-
 /*
  *  Check that that the dispatch disable level is proper for the
  *  mode/state of the test.  Normally it should be 0 when in task space.