error: use of undeclared identifier '_exit'

Change-Id: I6802c8afe4b02ec8398fa9d62728694ddc6f770f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/115539
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/headless/headlessinst.cxx b/vcl/headless/headlessinst.cxx
index e1694c4..a644613 100644
--- a/vcl/headless/headlessinst.cxx
+++ b/vcl/headless/headlessinst.cxx
@@ -9,6 +9,7 @@
#include <headless/svpinst.hxx>
#include <headless/svpdummies.hxx>
#include <unx/gendata.hxx>
#include <unistd.h>

class HeadlessSalInstance : public SvpSalInstance
{