Ensure core.packedGitWindowSize cannot be less than 2 pages.

We cannot allow a window to be smaller than 2 system pages.
This limitation is necessary to support the feature of use_pack()
where we always supply at least 20 bytes after the offset to help
the object header and delta base parsing routines.

If packedGitWindowSize were allowed to be as small as 1 system page
then we would be completely unable to access an object header which
spanned over a page as we would never be able to arrange a mapping
such that the header was contiguous in virtual memory.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

config.c

@@ -302,8 +302,8 @@ int git_default_config(const char *var, const char *value)
 		int pgsz = getpagesize();
 		packed_git_window_size = git_config_int(var, value);
 		packed_git_window_size /= pgsz;
-		if (!packed_git_window_size)
-			packed_git_window_size = 1;
+		if (packed_git_window_size < 2)
+			packed_git_window_size = 2;
 		packed_git_window_size *= pgsz;
 		return 0;
 	}