service: fix C++ linkage

[ upstream commit 604d426 ]

"extern C" define is added to rte_service_component.h file
to be able to use in C++ context

Fixes: 2169835 ("service: introduce service cores concept")

Signed-off-by: Levend Sayar <levendsayar@gmail.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

lib/librte_eal/common/include/rte_service_component.h

@@ -9,6 +9,11 @@
  * Include this file if you are writing a component that requires CPU cycles to
  * operate, and you wish to run the component using service cores
  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <rte_compat.h>
 #include <rte_service.h>
 
@@ -130,4 +135,8 @@ int32_t rte_service_init(void);
  */
 void rte_service_finalize(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_SERVICE_PRIVATE_H_ */