Broken ar libdep bfd-plugin

[kallisti5]

The libdep plugin for bfd is an ar file which isn't compatible with our runtime_loader due to the program size of 0.

runtime_loader: /boot/system/lib/bfd-plugins/libdep.a: Incorrect ELF header

This can be reproduced by calling ar using the libdep plugin...

ar r --record-libdeps=libhaha.so libtest.a blah.o

All of our gcc toolchains have a libdep.a ar which is a single libdep_plugin.o within it.

Looking at Linux, it has a libdep.so.

The fault triggering is: ​https://cgit.haiku-os.org/haiku/tree/src/system/runtime_loader/elf_load_image.cpp#n425

[kallisti5]

Some more relevant information:

​https://sourceware.org/bugzilla/show_bug.cgi?id=27113

Looks like this has been a historical issue for them

[kallisti5]

Some more history. It looks like we shaved these runtime_loader checks down once before: ​https://review.haiku-os.org/c/haiku/+/2089