rtems: Move declartion of _RTEMS_version

Close #3978.

cpukit/include/rtems/score/copyrt.h

@@ -41,6 +41,16 @@ extern "C" {
  */
 extern const char _Copyright_Notice[];
 
+/**
+ * @brief This constant provides the RTEMS version string.
+ *
+ * The constant name does not follow the naming conventions.  Do not change it
+ * for backward compatibility reasons.
+ *
+ * @see rtems_get_version_string()
+ */
+extern const char _RTEMS_version[];
+
 #ifdef __cplusplus
 }
 #endif

cpukit/include/rtems/system.h

@@ -39,12 +39,6 @@ extern "C" {
 
 #ifndef ASM
 
-/*
- * The use of this variable is deprecated, use rtems_get_version_string()
- * instead.
- */
-extern RTEMS_DEPRECATED const char _RTEMS_version[];
-
 /**
  *  The following is the extern for the RTEMS copyright string.
  */

cpukit/sapi/src/getversionstring.c

@@ -19,9 +19,8 @@
 #include "config.h"
 #endif
 
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-
 #include <rtems.h>
+#include <rtems/score/copyrt.h>
 
 const char *rtems_get_version_string(void)
 {