xrdb 1.2.2

Merged Alan Coopersmith requested to merge alanc/xrdb:release into master
  • gitlab CI: add a basic build test
  • Build xz tarballs instead of bzip2
  • gitlab CI: stop requiring Signed-off-by in commits
  • Variable scope reduction as recommended by cppcheck
  • Use C99 struct initialization
  • Rename variable dup to avoid shadowing dup() function
  • Fallback asprintf: don't truncate output that has a \0 in string
  • configure: raise minimum autoconf requirement to 2.70
  • xrdb 1.2.2

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