Revert "Support sun.misc.Signal handlers (#1221)"

Shutdown code should be handled with a shutdown hook

This reverts commit 81a1fd4c86.

src/babashka/impl/classes.clj

@@ -404,8 +404,6 @@
           java.util.zip.ZipEntry
           java.util.zip.ZipException
           java.util.zip.ZipFile
-          sun.misc.Signal
-          sun.misc.SignalHandler
           ~(symbol "[B")
           ~(symbol "[I")
           ~(symbol "[Ljava.lang.Object;")

src/babashka/impl/proxy.clj

@@ -72,12 +72,7 @@
 
       ["javax.net.ssl.HostnameVerifier" #{}]
       (proxy [javax.net.ssl.HostnameVerifier] []
-        (verify [host-name session] ((method-or-bust methods 'verify) this host-name session)))
-
-      ["sun.misc.SignalHandler" #{}]
-      (proxy [sun.misc.SignalHandler] []
-        (handle [sig]
-          ((method-or-bust methods 'handle) this sig))))))
+        (verify [host-name session] ((method-or-bust methods 'verify) this host-name session))))))
 
 (defn class-sym [c] (symbol (class-name c)))
 

src/babashka/impl/reify.clj

@@ -183,7 +183,4 @@
      resolveAlias [[this sym]]
      resolveVar [[this sym]]}
 
-    sun.misc.SignalHandler
-    {handle [[this signal]]}
-
     }))