Delete dead files

[flaviut]

pendx.nim doesn't do anything and is not referenced anywhere

grep -nr 'pendx' ./compiler/
./compiler/syntaxes.nim:65:    # skinEndX: result := pendx.parseAll(p.parser);
./compiler/syntaxes.nim:76:    #skinEndX: result := pendx.parseTopLevelStmt(p.parser);

[Varriount]

To the best of my knowledge, it is planned for pendx.nim (as well as pbraces.nim) to hold parsing code for begin/end and brace delimited nimrod dialects. Thus, deleting them isn't really useful, all things considered.

[flaviut]

@Varriount It is a file that has not been modified for a year, those plans are probably on hold. Also, any code can be retrieved from git if needed.