Haxe: Do not track preprocessor for styling

We don't set the styles for inactive preprocessor sections, so we
should make sure they aren't used.  Also, Haxe has different
preprocessor directives than C does, which confuses LexCPP tracking
anyway.

Fixes #936.

data/filedefs/filetypes.haxe

@@ -7,6 +7,10 @@ primary=abstract break case catch class const continue trace do else enum extend
 secondary=Bool Dynamic Float Int null Void Enum String
 classes=Array ArrayAccess Class Date DateTools EReg Hash IntHash IntIter Iterable Iterator Lambda List Math Null Protected Reflect Std StringBuf StringTools Type UInt ValueType Xml XmlType
 
+[lexer_properties]
+# Haxe preprocessor has different directive than C, which the C lexer doesn't understand, so
+# we explicitly need not track the preprocessor at all.
+lexer.cpp.track.preprocessor=0
 
 [settings]
 # default extension used when saving files