* Add source line numbers to backtraces on linux.
* Fix -g (broken after token caching).
* reset the #line directives after all the v code is compiled
* cleanup p.cgen.line setting inside p.next() .
* Support windows filepaths like "C:\Users\travis\build\vlang\v\v.exe.tmp.c" inside generated #line directives.
* Try to diagnose better windows-gcc failing.
* Revert "Try to diagnose better windows-gcc failing."
* implement and use cescaped_path/1 .
* Use cescaped_path/1 consistently throughout compiler/ .