Remove code for clearing the close-on-exec flag as the dup2 function always clears that flag in the new FD.

Author: nirvdrum

src/main/ruby/core/truffle/process_operations.rb

@@ -422,11 +422,6 @@ def redirect_file_descriptor(from, to)
 
         result = Truffle::POSIX.dup2(to, from)
         Errno.handle if result < 0
-
-        flags = Truffle::POSIX.fcntl(from, Fcntl::F_GETFD, 0)
-        Errno.handle if flags < 0
-
-        Truffle::POSIX.fcntl(from, Fcntl::F_SETFD, flags & ~Fcntl::FD_CLOEXEC)
       end
 
       def spawn