Add --with-icu-inc=CFLAGS, but its justification (based on examination of a downstream build script) as iffy, so this needs to be considered more closely before committing to it. (Edit: no, we don't want to pass on any ICU-side CFLAGS when building the library, especially not the one provided by icu-config --clflags.) (tags: configure-with-icu-inc)

Add --with-icu-inc=CFLAGS, but its justification (based on examination of a downstream build script) as iffy, so this needs to be considered more closely before committing to it. (Edit: no, we don't want to pass on any ICU-side CFLAGS when building the library, especially not the one provided by icu-config --clflags.) (tags: configure-with-icu-inc)