ticket:10477: drop already-marginal support for ULOC_REQUESTED_LOCALE

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36252 251d0590-4201-4cf1-90de-194747b24ca1
ticket:11121: Fix cygwin msvc mh file detection


git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36253 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10435: deprecate collation TAILORINGS_VERSION

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36254 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9985: Add support for msys msvc build environment


git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36256 251d0590-4201-4cf1-90de-194747b24ca1