Build with utfproc8 and re2

[jonkeane]

No description provided.

[jeroen]

OK I deployed this, but note that now you need to fix your R package, because you built w/ libre2, but currently in your R package you only link to with -lre2 for rtools40, but not for the backport:

https://github.com/apache/arrow/blob/master/r/configure.win#L59

So you need to change that to link to -lre2 unconditionally.

Before you submit to cran make sure to test on winbuilder, in particular the R-oldrelease flavour, which uses this backport.

[jeroen]

Actually this doesn't seem to work with rtools35: https://win-builder.r-project.org/P5wwUznLPIRx/
I'll revert this for the backport.

[jeroen]

OK I have switched the backport to -DARROW_WITH_RE2=OFF and now it should probably work, as was intended in your configure script in the first place.

[jonkeane]

Thank you!