Ninja: Revert accidental LINK_WHAT_YOU_USE impl for static libraries

Đoàn Trần Công Danhrequested to merge
sgn/cmake:ninja-lwyu-ar into master

In !6263 (merged), we fixed usage of -Wl,--no-as-needed to override -Wl,--as-needed from LDFLAGS. However, that change also passes -Wl,--no-as-needed to ar, which is incorrect flag for ar.

Let's check the target type before passing down the flags.

Fixes: #22487 (closed)
Backport: release:HEAD^2

Edited by Brad King

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