ticket:8464: Make formatting relative dates with quantity more  efficient by preprocessing the pattern strings. Saves 650ns per format.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34784 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10334 C vs. J differences when in lenient mode

git-svn-id: http://source.icu-project.org/repos/icu/icu@34792 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10334 C vs. J differences when in lenient mode (remove windows specific debug code)

git-svn-id: http://source.icu-project.org/repos/icu/icu@34793 251d0590-4201-4cf1-90de-194747b24ca1