The change only affects JPS on TeamCity (in Intellij IC system property
is always set explicitly; the same holds for Gradle, Maven).
Previous changes have effectively enabled the new IC (which is now default)
for TC JPS builds, which is undesirable as more RAM is used.
Java sources should appear before classpath dependencies because they should
have higher priority if the same symbol is located in the module source and in
the classpath. This is so because by default module source has the highest
priority in IDEA except the JDK. Ideally this will be handled later by full
support of modules in the compiler
