Sync with upstream: ext/sockets

Author: petk

cmake/ext/sockets/CMakeLists.txt

@@ -104,6 +104,7 @@ check_include_files(sys/sockio.h HAVE_SYS_SOCKIO_H)
 check_include_files(linux/filter.h HAVE_LINUX_FILTER_H)
 check_include_files(linux/if_ether.h HAVE_LINUX_IF_ETHER_H)
 check_include_files(linux/if_packet.h HAVE_LINUX_IF_PACKET_H)
+check_include_files(linux/udp.h HAVE_LINUX_UDP_H)
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
   check_include_files(winsock.h _HAVE_WINSOCK_H)

cmake/ext/sockets/cmake/config.h.in

@@ -16,6 +16,9 @@
 /* Define to 1 if you have the <linux/if_packet.h> header file. */
 #cmakedefine HAVE_LINUX_IF_PACKET_H
 
+/* Define to 1 if you have the <linux/udp.h> header file. */
+#cmakedefine HAVE_LINUX_UDP_H 1
+
 /* Define to 1 if you have the 'sockatmark' function. */
 #cmakedefine HAVE_SOCKATMARK 1