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libc: lift limit on pool sizes

Machines can have a lot of ram these days; we should
allow programs to use it. This fixes some memory hungry
things like indexing the linux git repo.

--- a/sys/src/libc/port/malloc.c

+++ b/sys/src/libc/port/malloc.c

@@ -21,7 +21,7 @@

 static Pool sbrkmem = {

 	.name=		"sbrkmem",

-	.maxsize=	(3840UL-1)*1024*1024,	/* up to ~0xf0000000 */

+	.maxsize=	(intptr)~0, /* maximum signed size we can address */

 	.minarena=	4*1024,

 	.quantum=	32,

 	.alloc=		sbrkalloc,

--- a/sys/src/libc/port/pool.c

+++ b/sys/src/libc/port/pool.c

@@ -555,7 +555,7 @@

 	Alloc *b;

 	LOG(p, "newarena %lud\n", asize);

-	if(p->cursize+asize > p->maxsize) {

+	if(asize > p->maxsize || p->cursize > p->maxsize - asize) {

 		if(poolcompactl(p) == 0){

 			LOG(p, "pool too big: %llud+%lud > %llud\n",

 				(uvlong)p->cursize, asize, (uvlong)p->maxsize);

-- 

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