fix sigset macro for 64-bit systems (<< was overflowing due to wrong type)
diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index 219bf00..12f8ccf 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -82,7 +82,7 @@
#define SIGSYSCALL 34
#define SIGPT_SET ((sigset_t *)(unsigned long [1+(sizeof(long)==4)]){ \
- [sizeof(long)==4] = 3<<(32*(sizeof(long)>4)) })
+ [sizeof(long)==4] = 3UL<<(32*(sizeof(long)>4)) })
#define SIGTIMER_SET ((sigset_t *)(unsigned long [1+(sizeof(long)==4)]){ \
0x80000000 })