try_compile: Restore propagation of CMAKE_<LANG>_LINK_PIE_SUPPORTED

Refactoring in commit c4e890946a (try_compile: consistently add language
properties, 2020-06-15, v3.19.0-rc1~633^2) accidentally dropped the
`_LINK` part of the name.  It also miscounted array indexes in a way
that happened to propagate `CMAKE_<LANG>_LINK_NO_PIE_SUPPORTED` whether
or not it is needed for the CMP0083 NEW behavior.  Simplify the code and
fix the variable name.

Fixes: #26948