try to fix fossilBuild on github actions

haxe_libraries/kiss-vscode-api.hxml

@@ -0,0 +1,7 @@
+-lib kiss
+-lib vscode
+-lib hxnodejs
+-lib re-flex
+-cp /Users/nat/repos/kiss-vscode-api/src/
+-D kiss-vscode-api=0.0.0
+--macro Sys.println("haxe_libraries/kiss-vscode-api.hxml:6: [Warning] Using dev version of library kiss-vscode-api")

src/kiss/Kiss.hx

@@ -613,9 +613,11 @@ class Kiss {
 
         var rebuildMTime = Math.NEGATIVE_INFINITY;
         for (path in pathsWhichTriggerRebuild) {
-            var fileMTime = sys.FileSystem.stat(path).mtime.getTime();
-            if (fileMTime > rebuildMTime) {
-                rebuildMTime = fileMTime;
+            if(sys.FileSystem.exists(path)){
+                var fileMTime = sys.FileSystem.stat(path).mtime.getTime();
+                if (fileMTime > rebuildMTime) {
+                    rebuildMTime = fileMTime;
+                }
             }
         }