[TC6] makeOutputDir() revision breaks Jasper

[Scott Johnson]

Revision 441109 to JspCompilationContext.java results in makeOutputDir() 
returning false even if the desired outputDir exists.  This is because 
File.mkdirs() returns true  "if and only if the directory was created". If 
the directory already exists, makeOutputDir() is returning false, 
resulting in an IllegalStateException being thrown.

Possible fix that fits in with other recent revisions to 
JspCompilationContext.java:

    protected boolean makeOutputDir() {
        synchronized(outputDirLock) {
            File outDirFile = new File(outputDir);
            if (!outDirFile.mkdirs() && !outDirFile.exists())
                return false;
            else
                return true;
        }
    }