Backend should emit a warning when file names clash on case-insensitive FS

[DarkDimius]

No description provided.

[smarter]

Look what I found in GenBCode :)

       // todo: add back those checks
        /*val lowercaseJavaClassName = claszSymbol.javaClassName.toLowerCase
        caseInsensitively.get(lowercaseJavaClassName) match {
          case None =>
            caseInsensitively.put(lowercaseJavaClassName, claszSymbol)
          case Some(dupClassSym) =>
            reporter.warning(
              claszSymbol.pos,
              s"Class ${claszSymbol.javaClassName} differs only in case from ${dupClassSym.javaClassName}. " +
                "Such classes will overwrite one another on case-insensitive filesystems."
            )
        }*/

[DarkDimius]

:-) just remove comments around it and you're done :-)

[smarter]

Duplicate of #1077