Remove some unnecessary #includes of postmaster/interrupt.h

Commit 44fc6e259b removed a bunch of references to
SignalHandlerForCrashExit, leaving these #includes unneeded.

src/backend/postmaster/bgworker.c

@@ -18,7 +18,6 @@
 #include "pgstat.h"
 #include "port/atomics.h"
 #include "postmaster/bgworker_internals.h"
-#include "postmaster/interrupt.h"
 #include "postmaster/postmaster.h"
 #include "replication/logicallauncher.h"
 #include "replication/logicalworker.h"

src/backend/postmaster/postmaster.c

@@ -110,7 +110,6 @@
 #include "postmaster/auxprocess.h"
 #include "postmaster/bgworker_internals.h"
 #include "postmaster/fork_process.h"
-#include "postmaster/interrupt.h"
 #include "postmaster/pgarch.h"
 #include "postmaster/postmaster.h"
 #include "postmaster/syslogger.h"

src/backend/postmaster/startup.c

@@ -27,7 +27,6 @@
 #include "libpq/pqsignal.h"
 #include "miscadmin.h"
 #include "pgstat.h"
-#include "postmaster/interrupt.h"
 #include "postmaster/startup.h"
 #include "storage/ipc.h"
 #include "storage/latch.h"