O_RDWR and O_CREAT are defined in fcntl.h

Change-Id: I568ee2c3f103777720f6c39340a5915b10aeebb4
Signed-off-by: Michael Stahl <mstahl@redhat.com>

shell/source/unix/sysshell/recently_used_file.cxx

@@ -27,7 +27,7 @@
 #include <sys/file.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-
+#include <fcntl.h>
 #include <unistd.h>
 
 const OUString RECENTLY_USED_FILE_NAME(".recently-used");