RFR: 8294549: configure script should detect unsupported path [v2]

[Mike Duigou]

On Fri, 2 Dec 2022 13:13:17 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> I have removed the path checking from the top level configure script but changes are still required in the `configure` wrapper to correctly pass a potentially bad path for the real configure script. I considered adding the path checking to `basic.m4` in `BASIC_SETUP_PATHS` but could not understand why `UTIL_FIXUP_PATH(TOPDIR)` doesn't already reject the bad path like it promises. (I was also reminded just how loathsome autoconf is as a language–all the worst parts of shell with even more cruft and weirdness).
>
> @bondolo Do you want me to take over this bug, add you as a contributor, and get it committed? Otherwise I think if you incorporate my patch above, you're good to go.

@magicus I am fine with your solution, please proceed. Thank you for helping get this change over the line and I apologize for the slow followup.

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PR: https://git.openjdk.org/jdk/pull/10477