[patch #10282] port libtool to grep 3.8 and to POSIX

[Alex Ameen]

Follow-up Comment #2, patch #10282 (project libtool):

Thanks for the report and patch. 

Did you test to see if the new pattern still works with `grep` < 3.8 by any
chance?

Just to check my understanding here: the intention of `[[-]]L` is to escape
`"[-]L"` in M4, taking advantage of the old `grep "[-]-not-an-option";` trick
to force grep to recognize argument 1 as a pattern rather than a flag? This
one makes sense to me. 

The one I didn't totally understand was removing the `@<:@` handler; mostly
because I don't remember the context off hand. 




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