[CMAKE] Ensure the INIT section is placed at the end of a module. CORE-14683

[CMAKE] Ensure the INIT section is placed at the end of a module. CORE-14683

For MSVC, marking the section as discardable will do this automatically.
For GCC, we use a linker script that places it after the .reloc section
(which should be the last "real" section, check ld --verbose output for the
default linker script).

This fixes what seems to be a regression from r55835 (!).