clang.bbclass: fix recipe_sysroot_check_ld_is_lld

[jaskij]

Currently, the check added in #802 breaks my builds. I have been able to find, and fix, two cases:

• allarch recipes, where lld is simply not installed in native sysroot
• for some recipes (ed for example), ${bindir} evaluates to /bin, not /usr/bin, which results in incorrect path to lld

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[jaskij]

While those two changes fix most of my build errors after pulling in latest Kirkstone across the board, there is one more package I have failing (depmodwrapper-cross) which also complains about the ln call in this task, so I'm marking this as a draft.

[jaskij]

cc @liuming50 , as the author of the original patch

[jaskij]

Ah, depmodwrapper-cross is a special case, it's a script, but probably not truly suited to being marked allarch. Still, I did that as a workaround.

Hmm... perhaps just test if the file exists?

[ -f "${STAGING_BINDIR_NATIVE}/${TARGET_SYS}/${TARGET_PREFIX}ld.lld" ]

Anyway, removing draft designation.

[jaskij]

Closing in favor of #844