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libmach: change mach pgsize back from 4K to 2MB for amd64

the Mach page size is used to calculate segment alignment. its
not the real effective page size used by the kernel.

this fixes acid.

--- a/sys/src/libmach/6.c

+++ b/sys/src/libmach/6.c

@@ -105,7 +105,7 @@

 	0,			/* link register */

 	"setSB",		/* static base register name (bogus anyways) */

 	0,			/* static base register value */

-	0x1000,			/* page size */

+	0x200000,		/* page size (for segment alignment) */

 	0xffffffff80110000ull,	/* kernel base */

 	0xffff800000000000ull,	/* kernel text mask */

 	0x00007ffffffff000ull,	/* user stack top */

-- 

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