Remove hacks from squish install common script

74     # Check which platform
75     if uname -a |grep -q Darwin; then
76         usersGroup="staff"
77         mountFolder="/Volumes"
78         squishLicenseDir="/Users/qt"
79     elif uname -a |grep -q "el6\|el7"; then
80         usersGroup="qt"
81         mountFolder="/tmp"
82         squishLicenseDir="/root"
83     elif uname -a |grep -q "Ubuntu"; then
84         usersGroup="users"
85         mountFolder="/tmp"
86         squishLicenseDir="/home/qt"
87     else
88         usersGroup="users"
89         mountFolder="/tmp"
90         squishLicenseDir="/root"
91     fi