eal/freebsd: add missing C++ include guards

[ upstream commit 29fd052 ]

Add missing 'extern "C"' to file.

Fixes: 428eb98 ("eal: add OS specific header file")

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

lib/eal/freebsd/include/rte_os.h

@@ -5,6 +5,10 @@
 #ifndef _RTE_OS_H_
 #define _RTE_OS_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * This header should contain any definition
  * which is not supported natively or named differently in FreeBSD.
@@ -59,4 +63,8 @@ typedef cpuset_t rte_cpuset_t;
 } while (0)
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_OS_H_ */