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
@@ -11,6 +11,8 @@
  * Author(s): Michael Holzheu
  */
 
+#include <asm-generic/signal-defs.h>
+
 #include <errno.h>
 #include <string.h>
 #include <dirent.h>