Set PATH_MAX to 4096 if not defined (patch by Svante Signell <svante.signell@gmail.com>)

See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767542

svn path=/icecast/trunk/icecast/; revision=19321

src/source.c

@@ -28,6 +28,9 @@
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include <limits.h>
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
 #else
 #include <winsock2.h>
 #include <windows.h>