DependencyConstraintHandlerDelegate.kt

Remove `platform` dsl from constraint handler
These shortcuts define details of a dependency like attributes,
requested capabilities and 'endorse strict' status. These things
can not be defined on constraints. So these methods only cause
inconsistent behavior.

One can use constraints in combination with platforms like this to
control platform versions:

dependencies {
api platform("org:platform")
constraints {
api "org:platform:1.0"
}
}