Revert "signal() returns sighandler_t, not void *"

sadly, on darwin, sighandler_t is not defined

This reverts commit 7bb4dfd0bcadc7c6177d6fe88a4bcccf7fac98b9

diff --git a/build/rpmfc.c b/build/rpmfc.c
index 86dd36d14..48643a321 100644
--- a/build/rpmfc.c
+++ b/build/rpmfc.c
@@ -295,7 +295,7 @@ static int getOutputFrom(ARGV_t argv,
 	return -1;
     }
     
-    sighandler_t oldhandler = signal(SIGPIPE, SIG_IGN);
+    void *oldhandler = signal(SIGPIPE, SIG_IGN);
 
     child = fork();
     if (child < 0) {