ticket:10270 fix // comments in udat.h

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@34168 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10142: fix for old-style C

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@34169 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10142: just checking that I can commit.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@34171 251d0590-4201-4cf1-90de-194747b24ca1