main
ICU-22068 Cleanup inconsistent annotations between declarations and definitions
ICU-22714 fix zos build, use OpenXL
ICU-10879 Split out OBJECTS from Makefiles into separate files
ICU-22308 add alignas(16) to the data entry point definition not just to its struct declaration.
ICU-21107 Specify language standard versions C11 & C++17 also for MSVC
ICU-12809 only .cpp files no .c in ICU library code