It seems musl s390x port is missing some def

diff --git a/zfcpdump/zfcpdump.c b/zfcpdump/zfcpdump.c
index 70df501..9d3c0f2 100644
--- a/zfcpdump/zfcpdump.c
+++ b/zfcpdump/zfcpdump.c
@@ -13,6 +13,7 @@
  * it under the terms of the MIT license. See LICENSE for details.
  */
 
+#include <asm-generic/signal-defs.h>
 #include <asm/types.h>
 #include <ctype.h>
 #include <dirent.h>