strip extensions for smaller modules

[corka149]

The modules created with Go can be big. go build offers the possibility to reduce size by omitting debugging information and symbols. I found out in a test that this could reduce the size of a wheel by 42 %.

My suggestion would be to add 'strip': False to build_golang as a switch. This would add '-ldflags=-s -w' to go build or not.

[asottile]

is there a reason to not do this unconditionally? I generally prefer fewer options unless someone has an explicit usecase for toggling a value

[corka149]

Sounds reasonable. I changed it so that True is the default value for stripping. It might become handy in case of bugs. 😅