structs: move SLOT_CACHE_SIZE macro.

Only struct.c refers to this symbol, and so only struct.c
needs to be recompiled when someone experiments with different
values.

* lib.h (SLOT_CACHE_SIZE): Macro deleted here.

* struct.c (SLOT_CACHE_SIZE): Macro moved here.

1 files changed, 0 insertions, 2 deletions

diff --git a/lib.h b/lib.h
index 403a18de..d960e5f4 100644
--- a/lib.h
+++ b/lib.h
@@ -124,8 +124,6 @@ struct string {
   val alloc;
 };
 
-#define SLOT_CACHE_SIZE 8
-
 typedef struct {
   cnum id;
   cnum slot;