File fix-build.patch of Package keeperrl

diff --git a/stack_printer.cpp b/stack_printer.cpp
index 91f7140..886ab12 100644
--- a/stack_printer.cpp
+++ b/stack_printer.cpp
@@ -21,6 +21,7 @@
 #else
   #include <err.h>
   #include <execinfo.h>
+  #define SIGSTKSZ 4096
 #endif