kernel: guard include of signal.h more precisely.

Upgrading to WASI SDK 11.0 caused the WASM build to fail because WASM
does not have signals. (Arguably Yosys was broken even before, it was
just broken silently.)

diff --git a/kernel/log.h b/kernel/log.h
index 516744b50e94b9e32bf834c85bf5b53e289e25af..63590c4891b3a1ea5c551f2fc23f43715c421b34 100644 (file)
--- a/kernel/log.h
+++ b/kernel/log.h
@@ -55,7 +55,9 @@
 #else
 #  include <sys/time.h>
 #  include <sys/resource.h>
-#  include <signal.h>
+#  if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
+#    include <signal.h>
+#  endif
 #endif
 
 #if defined(_MSC_VER)