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git/save: sort unicode file paths correctly

when comparing the files in entcmp, we need to do an unsigned
comparison to sort the codepoints correctly, not a signed one.

--- a/sys/src/cmd/git/util.c

+++ b/sys/src/cmd/git/util.c

@@ -37,13 +37,13 @@

 entcmp(void *pa, void *pb)

 {

 	Dirent *ae, *be;

-	char *a, *b;

+	uchar *a, *b;

 	int ca, cb;

 	ae = pa;

 	be = pb;

-	a = ae->name;

-	b = be->name;

+	a = (uchar*)ae->name;

+	b = (uchar*)be->name;

 	/*

 	 * If the files have the same name, they're equal.

 	 * Otherwise, If they're trees, they sort as thoug

-- 

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