Changes

*/gen_links: remove TCCOpenSecurity_Functions.hh

The file TCCOpenSecurity_Functions.hh does not exist in a fresh clone of
titan.Libraries.TCCUsefulFunctions. Currently it only gets created after
gen_links.sh ran, created the symlink (to the not yet existing file) and
then ttcn3_compiler writes to it. Adjust the gen_links files to not
create this broken symlink.

Related: https://gitlab.eclipse.org/eclipse/titan/titan.Libraries.TCCUsefulFunctions/-/tree/master/src
Change-Id: Idab86fa1deb0256737167767ee7f5f2b36018df4