[Bug preprocessor/64965] __FILE__ doesn't work if the filename contains newline

[rv at rasmusvillemoes dot dk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64965

--- Comment #1 from Rasmus Villemoes <rv at rasmusvillemoes dot dk> ---
Created attachment 34693
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34693&action=edit
Make __FILE__ work for filenames containing newline