Use custom 'pkgduppdir'
mysql.server.sh:
  The server is installed in 'libexecdir'


scripts/Makefile.am:
  Use custom 'pkgduppdir'
scripts/make_binary_distribution.sh:
  Use custom 'pkgduppdir'
support-files/mysql.server.sh:
  The server is installed in 'libexecdir'