Fix typo in `bin/qio-config.cmake.in` : `-Wl.-rpath=` -> `-Wl,-rpath=`

[Jaden-Anderson]

In file bin/qio-config.cmake.in , there is a typo:

- -Wl.-rpath=@Clime_LIBDIR@
+ -Wl,-rpath=@Clime_LIBDIR@

The linker flag should use comma , to separate options after -Wl, . Using dot . will cause the option to be ignored, leading to missing RPATH at runtime.

This affects all users who rely on qio-config --ldflags for downstream builds.
Please consider applying this fix in the main repository.