/usr/lib/tcl8.5/pkgIndex.tcl is in libhamlib2-tcl 3.1-7build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
package ifneeded hamlib 3.1 [list load [file join $dir hamlibtcl-3.1.so] Hamlib]