Add missing cplusplus wrappers

Author: th-otto

include/sys/statvfs.h

@@ -1,11 +1,15 @@
 #ifndef	_SYS_STATVFS_H
 #define	_SYS_STATVFS_H
 
+__BEGIN_DECLS
+
 #include <bits/statvfs.h>
 
 int statvfs (const char *, struct statvfs *);
 #if 0
 int fstatvfs (int, struct statvfs *);
 #endif
 
+__END_DECLS
+
 #endif

include/sys/timeb.h

@@ -23,6 +23,8 @@
 # include <features.h>
 #endif
 
+__BEGIN_DECLS
+
 /* Structure returned by the `ftime' function.  */
 
 struct timeb {
@@ -35,4 +37,6 @@ struct timeb {
 /* For compatibility reasons.  Actually obsoleted by gettimeofday().  */
 extern int ftime (struct timeb *__timebuf) __THROW;
 
+__END_DECLS
+
 #endif	/* _SYS_TIMEB_h */