fix: add missing include in CMakeLists #942 (#1285)

* fix: missing include file for cmake function

* fix: using newer version of check include file

---------

Co-authored-by: rbevin777 <[email protected]>

Author: rbevin777

client_server/CMakeLists.txt

@@ -1,7 +1,9 @@
+include(CheckIncludeFile)
+
 if(WIN32)
-    check_include_file(winsock2.h WINSOCK_HEADER)
+    CHECK_INCLUDE_FILE(winsock2.h WINSOCK_HEADER)
 else()
-    check_include_file(arpa/inet.h ARPA_HEADERS)
+    CHECK_INCLUDE_FILE(arpa/inet.h ARPA_HEADERS)
 endif()
 
 if(ARPA_HEADERS OR WINSOCK_HEADER)