Cleanup, remove unused code, from support-files/CMakeLists.txt
- configure the three scripts in the same way
  destination INSTALL_SUPPORTFILESDIR
  component   Server_Scripts
- INSTALL_SHAREDIR contains *one* file: aclocal/mysql.m4
  so remove reference to it from router cmake code.

Change-Id: I120466027f3335cd373ed34e80bf540fcb4b4e28