Shader in build?

Target Platforms Mobile
1

Hi we got big size of shaders in build afer compile for android and we have no shader in project

with last unity 5.2.2

any idea how reduce unity_builtin_extra too
help please

2

i have deletee Library/ShaderCache folder
with no success

3

20 ~ 50 build today
no found solution
installed in beta 5.3 but error compile

4

Any Idea please

5

have try reimport projet