nios2: fix div64 issue for gcc4
This patch fixes the run-time error on div64 when built with gcc4, which was reported by jhwu0625 on nios forum. It merges math support from libgcc of gcc4. This patch is copied from nios2-linux. It works with both gcc3 and gcc4. The old mult.c, divmod.c and math.h are removed. Signed-off-by:Thomas Chou <thomas@wytron.com.tw> Signed-off-by:
Scott McNutt <smcnutt@psyent.com>
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