ICU-20526 fix pkgdata where LD_SONAME has a trailing space

- added PKGDATA_TRAILING_SPACE to all of the pkgdataMakefile.in file.
- NOTE: Users who create their own pkgdata.inc / icupkg.inc files may need
   to recreate this PKGDATA_TRAILING_SPACE behavior.

- used the above variable, normally undefined, in mh-* files that need a trailing space

- Also, fixed use of system() in pkgdata.cpp per ICU-20538
This was causing pkgdata to return a zero status even on clang
failure, masking this issue.
8 files changed
tree: a5340010457090179e265e854549846efe04c346
  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. README.md
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