ICU-20545 Detect file separator char from dir

If udata_create won't find U_FILE_SEP_CHAR at the end of a dir variable,
then it appends it. The problem starts if the dir variable uses
U_FILE_ALT_SEP_CHAR which is not equal to U_FILE_SEP_CHAR. Then the
resulting path could look like this
../data\mappings/cns-11643-1992.ucm
instead of this
../data/mappings/cns-11643-1992.ucm

This patch uses U_FILE_SEP_CHAR unless it detects that the dir variable
doesn't use it, and uses U_FILE_ALT_SEP_CHAR instead.
1 file changed
tree: 7a964ade9225c413148feb5160bf7354860742f9
  1. .ci-builds/
  2. .github/
  3. docs/
  4. icu4c/
  5. icu4j/
  6. tools/
  7. vendor/
  8. .appveyor.yml
  9. .cpyskip.txt
  10. .gitattributes
  11. .gitignore
  12. .travis.yml
  13. KEYS
  14. README.md
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International Components for Unicode

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