adapt to the coop-by-default syntax in our port

Index: mono/profiler/Makefile.am
--- mono/profiler/Makefile.am.orig
+++ mono/profiler/Makefile.am
@@ -36,7 +36,7 @@ suppression_DATA = mono-profiler-coverage.suppression
 # sampling infrastructure depends on signals being available.
 #
 # See: https://bugzilla.xamarin.com/show_bug.cgi?id=57011
-if !ENABLE_COOP_SUSPEND
+if DISABLE_COOP_SUSPEND
 check_targets = run-test
 endif