Fix #337: Import lisp::+ascii-limit+ to the C package
When cross-compiling from linux/x86 to linux/x86, we cross-compile
srctran.lisp. It appears that this fails because the constant +ascii-limit+
is
not available because it's defined in char.lisp.
To fix this, import lisp::+ascii-limit+
to the C
package that is used by srctran.lisp.
Edited by Raymond Toy