libgcrypt: conflict with darwin when @1.11.0 (#45264)

Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

var/spack/repos/builtin/packages/libgcrypt/package.py

@@ -41,6 +41,9 @@ class Libgcrypt(AutotoolsPackage):
     depends_on("libgpg-error@1.27:", when="@1.9:")
     depends_on("libgpg-error@1.49:", when="@1.11:")
 
+    # See  https://dev.gnupg.org/T7170
+    conflicts("platform=darwin", when="@1.11.0")
+
     def flag_handler(self, name, flags):
         # We should not inject optimization flags through the wrapper, because
         # the jitter entropy code should never be compiled with optimization