Remove now unneeded cmake test and define

src/csync/ConfigureChecks.cmake

@@ -29,7 +29,6 @@ if(WIN32)
   set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} psapi kernel32)
 endif()
 
-check_function_exists(timegm HAVE_TIMEGM)
 check_function_exists(utimes HAVE_UTIMES)
 check_function_exists(lstat HAVE_LSTAT)
 

src/csync/config_csync.h.cmake

@@ -8,7 +8,6 @@
 
 #cmakedefine HAVE_ARGP_H 1
 
-#cmakedefine HAVE_TIMEGM 1
 #cmakedefine HAVE_UTIMES 1
 #cmakedefine HAVE_LSTAT 1