llex.c: make MAXSRC configurable

[Shmuel Zeigerman <shmuz@...>]

My program (a Lua-based plug-in to another program) compiles and runs 
Lua scripts. If there's an error in one of the scripts (either 
compilation or run-time error), the program parses the error message and 
prompts the user to jump to the error origin (file:line:).

If a file path is too long, it gets processed by Lua to fit into the 
predefined buffer size (either LUA_IDSIZE or MAXSRC), making impossible 
to extract its exact value from the error message.

While LUA_IDSIZE value can be configured via luaconf.h, MAXSRC can not, 
therefore one has to modify llex.c. Could it be changed in Lua 5.2 (or 
in Lua 5.1.5)?

--
Shmuel