IDE: Try to improve the custom defines GUI.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42475 4005530d-fff6-0310-9dd1-cebe43e6787f
install: changed default test build directory for unix: ~/tmp

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42476 4005530d-fff6-0310-9dd1-cebe43e6787f