Remove fake malloc.
 [jmk] --rw-rw-r-- M 23513 jmk sys 445 Dec 10 19:39 sys/src/cmd/7l/compat.c
 [jmk] --rwxrwxr-- M 23513 glenda sys 5002 Dec 10 19:39 sys/src/cmd/7l/l.h
	/n/sourcesdump/2005/1210/plan9/sys/src/cmd/7l/l.h:286,291 - 
	/n/sourcesdump/2005/1211/plan9/sys/src/cmd/7l/l.h:286,292
	  void	lput(long);
	  void	lputbe(long);
	  void	mkfwd(void);
	+ void*	mysbrk(ulong);
	  void	names(void);
	  void	nocache(Prog*);
	  void	noops(void);
 [jmk] --rwxrwxr-- M 23513 glenda sys 372 Dec 10 19:39 sys/src/cmd/7l/mkfile
	/n/sourcesdump/2005/1210/plan9/sys/src/cmd/7l/mkfile:11,16 - 
	/n/sourcesdump/2005/1211/plan9/sys/src/cmd/7l/mkfile:11,17
	  	sched.$O\
	  	span.$O\
	  	enam.$O\
	+ 	compat.$O\
	  
	  HFILES=\
	  	l.h\
 [jmk] --rwxrwxr-- M 23513 glenda sys 22824 Dec 10 19:39 sys/src/cmd/7l/obj.c
	/n/sourcesdump/2005/1210/plan9/sys/src/cmd/7l/obj.c:1032,1038 - 
	/n/sourcesdump/2005/1211/plan9/sys/src/cmd/7l/obj.c:1032,1038
	  		if(thunk >= 25L*NHUNK)
	  			nh = 25L*NHUNK;
	  	}
	- 	h = sbrk(nh);
	+ 	h = mysbrk(nh);
	  	if(h == (char*)-1) {
	  		diag("out of memory");
	  		errorexit();
	/n/sourcesdump/2005/1210/plan9/sys/src/cmd/7l/obj.c:1316,1362 - 
	/n/sourcesdump/2005/1211/plan9/sys/src/cmd/7l/obj.c:1316,1319
	  	exp = (ieee->h>>20) & ((1L<<11)-1L);
	  	exp -= (1L<<10) - 2L;
	  	return ldexp(fr, exp);
	- }
	- 
	- /*
	-  * fake malloc
	-  */
	- void*
	- malloc(ulong n)
	- {
	- 	void *p;
	- 
	- 	while(n & 7)
	- 		n++;
	- 	while(nhunk < n)
	- 		gethunk();
	- 	p = hunk;
	- 	nhunk -= n;
	- 	hunk += n;
	- 	return p;
	- }
	- 
	- void
	- free(void *p)
	- {
	- 	USED(p);
	- }
	- 
	- void*
	- calloc(ulong m, ulong n)
	- {
	- 	void *p;
	- 
	- 	n *= m;
	- 	p = malloc(n);
	- 	memset(p, 0, n);
	- 	return p;
	- }
	- 
	- void*
	- realloc(void*, ulong)
	- {
	- 	fprint(2, "realloc called\n");
	- 	abort();
	- 	return 0;
	  }