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libc: dont use floating point for portable umuldiv(), use 64 bit uvlong

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

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

@@ -4,12 +4,7 @@

 ulong

 umuldiv(ulong a, ulong b, ulong c)

 {

-	double d;

-

-	d = ((double)a * (double)b) / (double)c;

-	if(d >= 4294967296.)

-		abort();

-	return d;

+	return ((uvlong)a * (uvlong)b) / c;

 }

 long