[compilers] Fix c/c++ compilation warnings and errors

components/libc/compilers/common/extension/sys/stat.h

@@ -14,6 +14,10 @@
 #include <sys/types.h>
 #include <sys/time.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define S_IFMT               00170000
 #define S_IFSOCK             0140000
 #define S_IFLNK              0120000
@@ -80,4 +84,8 @@ int    mknod(const char *, mode_t, dev_t);
 int    stat(const char *, struct stat *);
 mode_t umask(mode_t);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif