MariaRocks: fix compilation on Oracle Linux Server 7.3.

#define __STDC_FORMAT_MACROS. Unfortunately there is no single location
that would be #includ'ed before everything else. Have to put the #define
into each .cc file

storage/rocksdb/ha_rocksdb.cc

@@ -20,6 +20,9 @@
 
 #define MYSQL_SERVER 1
 
+/* For use of 'PRIu64': */
+#define __STDC_FORMAT_MACROS
+
 #include <my_config.h>
 
 #include <inttypes.h>

storage/rocksdb/rdb_cf_manager.cc

@@ -18,6 +18,9 @@
 #pragma implementation // gcc: Class implementation
 #endif
 
+/* For use of 'PRIu64': */
+#define __STDC_FORMAT_MACROS
+
 #include <my_config.h>
 
 #include <inttypes.h>

storage/rocksdb/rdb_datadic.cc

@@ -18,6 +18,9 @@
 #pragma implementation // gcc: Class implementation
 #endif
 
+/* For use of 'PRIu64': */
+#define __STDC_FORMAT_MACROS
+
 #include <my_config.h>
 /* This C++ file's header file */
 #include "./rdb_datadic.h"