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

[Paul Eggert]

Follow-up Comment #3, patch #10282 (project libtool):

[comment #2 comment #2:]

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

> 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?
Yes, that's right.

> The one I didn't totally understand was removing the `@<:@` handler; mostly
because I don't remember the context off hand. 
Without the patch, a test is generated that runs a shell command like this:


grep '\]'


This usage of grep is not portable, since POSIX says that the regular
expression \] has undefined effect (unlike \[ which is well defined to match
an opening square bracket). A failure of the test does not mean that grep is
broken; it means libtool is broken. To fix libtool, we should remove the
incorrect test.


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