[PATCH] Fix PR59447: include "(or later)" in documentation of --with-dwarf2 configure flag

[Eric Gallager via Gcc-patches]

A pretty simple patch; borrowed from Andrew Pinski on bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59447
Tested by doing `./configure --help` in the gcc subdirectory and
noting that the "(or later)" made it into the output. OK for trunk?

gcc/ChangeLog:

    PR bootstrap/59447
    * configure: Regenerate.
    * configure.ac: Document --with-dwarf2 flag as also applying to
later DWARF standards.
    * doc/install.texi: Likewise.

patch-PR59447.diff
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