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packfiles: make cache size tunable.

For serving, the cache is mostly useless, since we
do a walk of all objects, ideally once; we also tend
to hog a bunch of ram and possibly fall over if there
are a bunch of concurrent clones.

To make serving better, allow tuning the cache size
via an environment variable.

--- a/git.h

+++ b/git.h

@@ -20,8 +20,6 @@

 typedef struct Dblock	Dblock;

 enum {

-	/* 5k objects should be enough */

-	Cachemax	= 5*1024,

 	Pathmax		= 512,

 	Hashsz		= 20,

 	Pktmax		= 65536,

@@ -227,6 +225,7 @@

 extern Objset	objcache;

 extern Hash	Zhash;

 extern int	chattygit;

+extern int	cachemax;

 #pragma varargck type "H" Hash

 #pragma varargck type "T" int

--- a/pack.c

+++ b/pack.c

@@ -49,6 +49,7 @@

 Object *lruhead;

 Object *lrutail;

 int	ncache;

+int	cachemax = 1024;

 static void

 clear(Object *o)

@@ -137,7 +138,7 @@

 		ref(o);

 		ncache++;

 	}

-	while(ncache > Cachemax){

+	while(ncache > cachemax){

 		p = lrutail;

 		lrutail = p->prev;

 		lrutail->next = nil;