Fix the 'trees' sample for gcc compilation (case problem)
tree9d47d7aa3de88cd3a49cc1d719efaddeec339a7f
drwxr-xr-x - build
drwxr-xr-x - doc
-rw-r--r-- 26434 licence.txt
-rw-r--r-- 37 qanava.pro
-rw-r--r-- 4667 readme.txt
drwxr-xr-x - src
drwxr-xr-x - tests