signal: fix build warnings

Need strings.h for strcasecmp

(Although I don't really think it's necessary to support lower case
versions of signal names. This will probably change).

Fixes #270

Signed-off-by: Steve Bennett <[email protected]>

Author: msteveb

auto.def

@@ -236,7 +236,7 @@ if {[opt-bool coverage]} {
     }
 }
 
-cc-check-includes time.h sys/time.h sys/socket.h netinet/in.h arpa/inet.h netdb.h
+cc-check-includes time.h sys/time.h sys/socket.h netinet/in.h arpa/inet.h netdb.h strings.h
 cc-check-includes util.h pty.h sys/un.h dlfcn.h unistd.h dirent.h crt_externs.h execinfo.h
 
 # Check sizeof time_t so we can warn on non-Y2038 compliance

jim-signal.c

@@ -11,6 +11,10 @@
 #ifdef HAVE_UNISTD_H
     #include <unistd.h>
 #endif
+#ifdef HAVE_STRINGS_H
+    #include <strings.h>
+#endif
+
 #include <jim-subcmd.h>
 #include <jim-signal.h>