Desubroutinize if needed

For example, running it on Noto's third_party/noto_cjk/NotoSansKR-Regular.otf results in:

```
roozbeh@machine-name:~/compreffor/compreffor$ ./cxxCompressor.py NotoSansKR-Regular.otf
Warning: There are subrs in NotoSansKR-Regular.otf
Traceback (most recent call last):
File "./cxxCompressor.py", line 387, in
main(**kwargs)
File "./cxxCompressor.py", line 342, in main
handle_font(filename)
File "./cxxCompressor.py", line 320, in handle_font
font.save(out_name)
File "/home/roozbeh/fonttools/Lib/fontTools/ttLib/__init__.py", line 214, in save
self._writeTable(tag, writer, done)
File "/home/roozbeh/fonttools/Lib/fontTools/ttLib/__init__.py", line 629, in _writeTable
tabledata = self.getTableData(tag)
File "/home/roozbeh/fonttools/Lib/fontTools/ttLib/__init__.py", line 642, in getTableData
return self.tables[tag].compile(self)
File "/home/roozbeh/fonttools/Lib/fontTools/ttLib/tables/C_F_F_.py", line 20, in compile
self.cff.compile(f, otFont)
File "/home/roozbeh/fonttools/Lib/fontTools/cffLib.py", line 72, in compile
for child in topCompiler.getChildren(strings):
File "/home/roozbeh/fonttools/Lib/fontTools/cffLib.py", line 243, in getChildren
children.extend(topDict.getChildren(strings))
File "/home/roozbeh/fonttools/Lib/fontTools/cffLib.py", line 1422, in getChildren
charStringsComp = CharStringsCompiler(items, strings, self)
File "/home/roozbeh/fonttools/Lib/fontTools/cffLib.py", line 180, in __init__
self.items = self.getItems(items, strings)
File "/home/roozbeh/fonttools/Lib/fontTools/cffLib.py", line 286, in getItems
cs.compile()
File "/home/roozbeh/fonttools/Lib/fontTools/misc/psCharStrings.py", line 289, in compile
"seac"), "illegal CharString"
AssertionError: illegal CharString
```