8187667: Disable deprecation warning for readdir_r

Reviewed-by: dholmes, sjohanss

src/hotspot/os/linux/os_linux.inline.hpp

@@ -98,6 +98,11 @@ inline int os::ftruncate(int fd, jlong length) {
 
 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
 {
+// readdir_r has been deprecated since glibc 2.24.
+// See https://sourceware.org/bugzilla/show_bug.cgi?id=19056 for more details.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
   dirent* p;
   int status;
   assert(dirp != NULL, "just checking");
@@ -111,6 +116,8 @@ inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
     return NULL;
   } else
     return p;
+
+#pragma GCC diagnostic pop
 }
 
 inline int os::closedir(DIR *dirp) {