Update xsltUnicodeSortFunction() in XSLTUnicodeSort.cpp with changes from GNOME libxslt issue #78. <https://gitlab.gnome.org/GNOME/libxslt/-/issues/78> <https://gitlab.gnome.org/GNOME/libxslt/-/commit/e7374c3b9f1b1652862af1d37755611b00e4079e> The function was originally based on `examples/xsltICUSort.c`. <rdar://101996640>
Pull request: https://github.com/WebKit/WebKit/pull/6187
Committed 256459@main (6649227d017b): <https://commits.webkit.org/256459@main> Reviewed commits have been landed. Closing PR #6187 and removing active labels.