Trivial fixes in appclient.sh and jdr.sh

Minor changes in bin/appclient.sh and bin/jdr.sh:

• appclient:
  • fix of HAS_OPENJDK variable name
  • use || instead of -o as it is better defined
• jdr:
  • used simplier syntax for if statement condition
  • fix of assignment statement "cygwin = true" -> "cygwin=true"