crypto: downgrade DEP0115 to --pending-deprecation only

Aliases are very cheap to maintain, so an unconditional runtime
deprecation that affects existing ecosystem code is not
a good idea. This commit turns the runtime deprecation into
a `--pending-deprecation` one.

Fixes: nodejs#23013

doc/api/deprecations.md

@@ -2168,12 +2168,12 @@ changes:
     description: Runtime deprecation.
 -->
 
-Type: Runtime
+Type: Runtime (supports [`--pending-deprecation`][])
 
 In recent versions of Node.js, there is no difference between
 [`crypto.randomBytes()`][] and `crypto.pseudoRandomBytes()`. The latter is
 deprecated along with the undocumented aliases `crypto.prng()` and
-`crypto.rng()` in favor of [`crypto.randomBytes()`][] and will be removed in a
+`crypto.rng()` in favor of [`crypto.randomBytes()`][] and may be removed in a
 future release.
 
 <a id="DEP0116"></a>

lib/crypto.js

@@ -36,6 +36,7 @@ const {
   ERR_CRYPTO_FIPS_UNAVAILABLE
 } = require('internal/errors').codes;
 const constants = process.binding('constants').crypto;
+const { pendingDeprecation } = process.binding('config');
 const {
   fipsMode,
   fipsForced
@@ -243,19 +244,24 @@ Object.defineProperties(exports, {
   },
 
   // Aliases for randomBytes are deprecated.
-  // The ecosystem needs those to exist for backwards compatibility with
-  // ancient Node.js runtimes (0.10, 0.12).
+  // The ecosystem needs those to exist for backwards compatibility.
   prng: {
     enumerable: false,
-    value: deprecate(randomBytes, 'crypto.prng is deprecated.', 'DEP0115')
+    value: pendingDeprecation ?
+      deprecate(randomBytes, 'crypto.prng is deprecated.', 'DEP0115') :
+      randomBytes
   },
   pseudoRandomBytes: {
     enumerable: false,
-    value: deprecate(randomBytes,
-                     'crypto.pseudoRandomBytes is deprecated.', 'DEP0115')
+    value: pendingDeprecation ?
+      deprecate(randomBytes,
+                'crypto.pseudoRandomBytes is deprecated.', 'DEP0115') :
+      randomBytes
   },
   rng: {
     enumerable: false,
-    value: deprecate(randomBytes, 'crypto.rng is deprecated.', 'DEP0115')
+    value: pendingDeprecation ?
+      deprecate(randomBytes, 'crypto.rng is deprecated.', 'DEP0115') :
+      randomBytes
   }
 });

test/parallel/test-crypto-random.js

@@ -19,6 +19,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+// Flags: --pending-deprecation
 'use strict';
 const common = require('../common');