[sqlite] why not get max-constants from limits.h ?

[Evans, Mark (Tandem)]

I am building sqlite 3.5.0 using x-dev tools for HP NonStop OSS target
machine and am working through some issues.  One of the issues is a
compiler error that results from a literal, SQLITE_BIG_DBL, used in
src/where.c.  That literal is defined in sqliteInt.h as (1e99) which is
bigger than the maximum double for this machine, defined in
/usr/include/limits.h as #define DBL_MAX  1.15792089237316192e77.  I can
obviously work around this problem by adding a -DSQLITE_BIG_DBL to the
c-flags, but I'm curious why sqlite does not #include <limits.h> and use
DBL_MAX as the default value for SQLITE_BIG_DBL.

Regards,
Mark