Native scripts run linker each time

[romanowski]

From @tpasternak :

#!/usr/bin/env scala-cli
using scala 2.13
using native
println("hello")

output:

$  ./ls.sc
Linking (1027 ms)
Discovered 972 classes and 7872 methods
Generating intermediate code (1619 ms)
Produced 4 files
Compiling to native code (760 ms)
Linking native code (immix gc, none lto) (152 ms)
Total (3598 ms)
hello

as a result, it's slow

From @WojciechMazur :

In the Scala Native 0.4.1 sbt caching mechanism will be used to skip subsequent builds, if you'll manage to implement something similar we will be glad to backport it thus allow to use it for all build tools.
What's important for the SN side we need to track both changes to input files and pass NativeConfig.