red-record-qxl: child_output_setup: remove fcntl call
red-record-qxl: child_output_setup: remove fcntl call

man 2 dup2 specifies:
  The close-on-exec flag (FD_CLOEXEC; see  fcntl(2))  for
  the duplicate descriptor is off.

Since the purpose of the fcntl call is to turn off FD_CLOEXEC
flag, and it's already done, just remove this call.

Suggested-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>
Signed-off-by: Uri Lublin <0332784c07b6f27b46541214503bc0da50f0f291@redhat.com>
Acked-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>

fgouget/spice,fgouget/spice,fgouget/spice,fgouget/spice