kill HAVE_FORKEXEC

Bug: 18317407
Change-Id: Idd4e0effa96752e2c0ca959728f80df4d2d34187
diff --git a/minadbd/adb.c b/minadbd/adb.c
index 127d072..0ac16e4 100644
--- a/minadbd/adb.c
+++ b/minadbd/adb.c
@@ -379,7 +379,7 @@
 int adb_main()
 {
     atexit(adb_cleanup);
-#if defined(HAVE_FORKEXEC)
+#if !defined(_WIN32)
     // No SIGCHLD. Let the service subproc handle its children.
     signal(SIGPIPE, SIG_IGN);
 #endif