Add support for Bison versions up to 3.7

This requires copying the `YY_CAST` and `YY_ATTRIBUTE_UNUSED` macros
from the generated code, and extracting the `yysymbol_kind_t` enum if
it's defined.

We must also handle token type names with escaped double-quotes in
them, since it now names the `YYEOF` and `YYUNDEF` tokens `"end of
file"` and `"invalid token"` instead of `$end` and `$undefined`,
respectively.

1 files changed, 1 insertions, 1 deletions

diff --git a/perly.h b/perly.h
index 5a3cef7cf5..c86560aada 100644
--- a/perly.h
+++ b/perly.h
@@ -196,5 +196,5 @@ int yyparse (void);
 
 /* Generated from:
  * f83d884147747f2d8f5a62eebc4ccd07d71b6b34e5ba1a8d7559526ad864dc97 perly.y
- * 1b401b34e1842dd8814919ea427f1b13abc479699495e6e88f8fe4c7ab2f838f regen_perly.pl
+ * 40aee1e96522879ab043fac10286df9e97b2db0197ad63dc6946ae7a61444afb regen_perly.pl
  * ex: set ro: */