[Minor] Debian: set BUILD_WITH_INSTALL_RPATH=ON

[Minor] Debian: set BUILD_WITH_INSTALL_RPATH=ON

* Use the install RPATH to avoid relinking at install time.
* This additionally ensures reproducible builds invariant of the build
  directory since build paths such as `X/src:X/contrib/replxx:...` are
  no longer embedded in the binary.
* This assumes that binaries are not ran at build time. If this is
  needed, CMAKE_BUILD_RPATH_USE_ORIGIN=ON can be used instead (requires
  CMake 3.14). For older CMake, try setting LD_LIBRARY_PATH.