enable passing of a hint how many pointers we’ll need to anew()

if 0, the default is used

sh.h

@@ -103,7 +103,7 @@
 #define __SCCSID(x)	__IDSTRING(sccsid,x)
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.257 2008/11/12 04:55:19 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.258 2008/11/15 07:35:24 tg Exp $");
 #endif
 #define MKSH_VERSION "R36 2008/11/11"
 
@@ -1247,7 +1247,7 @@ EXTERN int histsize;	/* history size */
 EXTERN struct timeval j_usrtime, j_systime;
 
 /* alloc.c */
-PArea anew(void);			/* cannot fail */
+PArea anew(size_t);			/* cannot fail */
 void adelete(PArea *);
 void *alloc(size_t, size_t, PArea);	/* cannot fail */
 void *aresize(void *, size_t, size_t, PArea);