Avoid forcing evaluation of crypto

Having `val crypto` in the package object means that when it's undefined
an exception is thrown immediately, which makes it impossible to use the
WebCrypto facade in such a case.

An example situation where this is preventative is using the WebCrypto
API from Node where its available as a library and not globally
available.

Author: japgolly

src/main/scala/org/scalajs/dom/crypto/package.scala

@@ -7,7 +7,7 @@ import scala.scalajs.js.|
 import scala.language.implicitConversions
 
 package object crypto {
-  val crypto = GlobalCrypto.crypto
+  @inline def crypto = GlobalCrypto.crypto
 
   type BigInteger = Uint8Array