syscalls/fanotify13: new test to verify FAN_REPORT_FID functionality

A newly defined test file to validate the fanotify FAN_REPORT_FID
functionality. A new line entry for this test file has been added within
runtest/syscalls.

Additionally, defined a helper function that can be used to obtain
__kernel_fsid_t and file_handle objects. This helper will be used by
test files related to verifying FAN_REPORT_FID. The name_to_handle_at()
function is conditionally added to accommodate for builds on older
distributions.

Added _GNU_SOURCE feature test macro to syscalls/fanotify05 in order to
resolve build warnings.

Signed-off-by: Matthew Bobrowski <mbobrowski@mbobrowski.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
diff --git a/configure.ac b/configure.ac
index 65fc2a2..f78db90 100644
--- a/configure.ac
+++ b/configure.ac
@@ -70,6 +70,7 @@
     kcmp \
     mkdirat \
     mknodat \
+    name_to_handle_at \
     openat \
     pidfd_send_signal \
     preadv \