PLT/GOT indirections are required in some cases. Most commonly when
calling functions from other shared libraries, but also in some
scenarios when calling functions with default symbol visibility
even within the same component on certain elf64 platforms.

On elf64 we can simply use PLT relocations for all calls to external
functions. Since the linker is able to eliminate unnecessary PLT
indirections with the final output binary being identical to non-PLT
relocations there isn't really any downside to doing so. This mimics
what regular compilers normally do for calls to external functions.

On elf32 with PIC we can use a function pointer from the GOT when
calling external functions, similar to what regular compilers do when
using -fno-plt. Since this both introduces overhead and clobbers one
register, which could potentially have been used for custom calling
conventions when calling other asm functions within the same library,
it's only performed for functions declared using 'cextern_naked'.