[test] Fix ELF/linkerscript/input-archive.s w/ @ in path

Lld test ELF/linkerscript/input-archive.s fails when path contain a @
because is not accepted in unquoted token in linker scripts which leads
to the path being broken in 2 around the @. This commit quotes the path
used in the linker script created by this and similar testcases allowing
the test to pass even in the presence of an @ sign in the path.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D79103