We're trying to update the version of Janet used in TIC-80 and are encountering issues for Windows builds in CI.

When trying to build via TIC-80's cmake generated files, the following sort of output is observed:

state.obj : error LNK2019: unresolved external symbol _InterlockedIncrement referenced in function _janet_interpreter_interrupt [D:\a\TIC-80\TIC-80\build\janet.vcxproj]
state.obj : error LNK2019: unresolved external symbol _InterlockedDecrement referenced in function _janet_interpreter_interrupt_handled [D:\a\TIC-80\TIC-80\build\janet.vcxproj]
build\janet_boot.exe : fatal error LNK1120: 2 unresolved externals [D:\a\TIC-80\TIC-80\build\janet.vcxproj]

via: https://github.com/nesbox/TIC-80/actions/runs/6223953191/job/16891060122?pr=2306#step:4:1692

I noticed that some other source files under Janet's src/core have includes for the Windows case, so I tried the following patch to src/core/state.c:

diff --git a/src/core/state.c b/src/core/state.c
index 4c976da..b17fb9d 100644
--- a/src/core/state.c
+++ b/src/core/state.c
@@ -53,6 +53,10 @@ void janet_vm_load(JanetVM *from) {
     janet_vm = *from;
 }
 
+#ifdef JANET_WINDOWS
+#include "windows.h"
+#endif
+
 /* Trigger suspension of the Janet vm by trying to
  * exit the interpeter loop when convenient. You can optionally
  * use NULL to interrupt the current VM when convenient */

This made the build work for TIC-80 on Windows (at least in a local setup meant to mimick relevant aspects of GitHub's CI).

Is the above sort of change superfluous [1]?

cc: @AlecTroemel

[1] I don't understand why Janet itself (outside of the TIC-80 context) builds fine without it (via an appropriate Native command prompt -- I verified this) and the build fails for TIC-80. Both invoke build_win.bat...so I guess something may be different about TIC-80's setup but I have not succeeded in determining what that is.