skip signal handler in alloc-counting tests

Author: arnetheduck

tests/destructor/tgotoexc_leak.nim

@@ -1,7 +1,7 @@
 discard """
   output: '''0
 true'''
-  cmd: "nim c --gc:arc $file"
+  cmd: "nim c --gc:arc -d:noSignalHandler $file"
 """
 
 # bug #22398

tests/destructor/tsimpleclosure.nim

@@ -1,5 +1,5 @@
 discard """
-  cmd: '''nim c -d:nimAllocStats --gc:arc $file'''
+  cmd: '''nim c -d:nimAllocStats -d:noSignalHandler --gc:arc $file'''
   output: '''a b
 70
 hello

tests/destructor/tv2_raise.nim

@@ -1,6 +1,6 @@
 discard """
   valgrind: true
-  cmd: '''nim c -d:nimAllocStats --newruntime $file'''
+  cmd: '''nim c -d:nimAllocStats -d:noSignalHandler --newruntime $file'''
   output: '''OK 3
 (allocCount: 7, deallocCount: 4)'''
 """