[FileUtils] Fixed file separator/pathSeparator as not always set.

[siad007]

Removed buggy code.

[codecov]

Codecov Report

Merging #1318 into master will increase coverage by 0.01%.
The diff coverage is 76.00%.

@@             Coverage Diff              @@
##             master    #1318      +/-   ##
============================================
+ Coverage     51.64%   51.65%   +0.01%     
- Complexity     9277     9278       +1     
============================================
  Files           477      477              
  Lines         22655    22658       +3     
============================================
+ Hits          11701    11705       +4     
+ Misses        10954    10953       -1     

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/tasks/ext/property/PathToFileSet.php	0.00% <0.00%> (ø)	18.00 <0.00> (ø)
classes/phing/tasks/system/ApplyTask.php	70.10% <40.00%> (ø)	102.00 <0.00> (ø)
classes/phing/util/FileUtils.php	70.76% <75.00%> (+1.11%)	84.00 <4.00> (+1.00)
classes/phing/Phing.php	37.03% <100.00%> (ø)	229.00 <0.00> (ø)
classes/phing/mappers/CutDirsMapper.php	92.85% <100.00%> (ø)	7.00 <0.00> (ø)
classes/phing/system/io/PhingFile.php	83.24% <100.00%> (ø)	92.00 <0.00> (ø)
classes/phing/tasks/system/PathConvert.php	61.15% <100.00%> (ø)	48.00 <0.00> (ø)
classes/phing/types/Commandline.php	85.81% <100.00%> (ø)	65.00 <0.00> (ø)
classes/phing/util/DirectoryScanner.php	68.44% <100.00%> (ø)	101.00 <0.00> (ø)

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