Merge pull request #9219 from putcn/fix-softmax-dep

add math_function to softmax's dep list

Author: luotao1

paddle/fluid/operators/math/CMakeLists.txt

@@ -43,7 +43,7 @@ math_library(sequence2batch)
 math_library(sequence_padding)
 math_library(sequence_pooling DEPS math_function)
 math_library(sequence_scale)
-math_library(softmax)
+math_library(softmax DEPS math_function)
 math_library(unpooling)
 math_library(vol2col)