FindBinUtils: Fall back to ld for Clang without lld

If `lld` is not available, Clang can still use `ld`.

Fixes: #22500
45 jobs for !6457 with prepend_lld_to_linker_list in 33 minutes (queued for 1 second)
latest detached
Status Name Job ID Coverage
  Build
passed build:centos6-x86_64 #6074797
cmake build docker linux manual

00:02:02

passed build:fedora34-ninja #6074798
cmake build docker linux linux-3.17 manual

00:01:12

manual build:macos-x86_64-makefiles #6074800
cmake macos shell xcode-12.5 nonconcurrent manual
manual build:macos-x86_64-ninja #6074799
cmake macos shell xcode-12.5 nonconcurrent manual
manual build:windows-vs2019-x64-ninja #6074801
cmake windows shell vs2019 msvc-19.29-16.10 nonconcurrent manual
passed lint:codespell #6074793
cmake build docker linux

00:00:37

passed lint:debian10-iwyu #6074794
cmake build docker linux

00:02:40

passed lint:fedora34-sphinx #6074796
cmake build docker linux linux-3.17

00:06:06

passed lint:fedora34-tidy #6074795
cmake build docker linux linux-3.17

00:27:07

 
  Test
passed test:fedora34-ninja #6074802
cmake docker linux linux-3.17 x11

00:05:24

created test:macos-x86_64-makefiles #6074804
cmake macos shell xcode-12.5 nonconcurrent
created test:macos-x86_64-ninja #6074803
cmake macos shell xcode-12.5 nonconcurrent
created test:windows-vs2019-x64-ninja #6074805
cmake windows shell vs2019 msvc-19.29-16.10 nonconcurrent
 
  Test Ext
passed test:cuda10.2-nvidia #6074808
cmake cuda-rt docker linux

00:29:52

passed test:debian10-ninja #6074806
cmake build docker linux linux-3.17

00:06:06

passed test:fedora34-makefiles #6074807
cmake build docker linux linux-3.17

00:03:10

passed test:fedora34-ninja-multi #6074809
cmake build docker linux linux-3.17

00:03:34

created test:macos-x86_64-xcode #6074810
cmake macos shell xcode-12.5 concurrent
created test:windows-vs2019-x64 #6074811
cmake windows shell vs2019 msvc-19.29-16.10 concurrent
 
  External
passed cdash

passed ghostflow-check-master

passed ghostflow-check-release

passed ghostflow-stager

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed ghostflow-check-master

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager