[bug #41246] Allow to switch shell batch mode at runtime instead of build time

[Mike Hommey]

Follow-up Comment #4, bug #41246 (project make):

> why not .BATCH_MODE_ONLY_SHELL, btw?

Apart from making it the same as the macro, the "only" feels too much for a
target name. I don't care that much for the name, though, your pick.

> which should at least be documented in the manual.

Would you mind doing this for me?

> can someone describe for me what BATCH_MODE_ONLY_SHELL does? Does is overlap
with ONESHELL?

In essence, this is like ONESHELL, except it writes the script to a file to
then run "sh thatfile" instead of doing sh -c "line1nline2nline3". This is
useful because msys bash on windows doesn't handle double quotes properly when
run with sh -c. I don't think non-Windows systems would need this as a
feature.

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