add a c-only target (no WASM)

targets/c-host/linux.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int wasm_module(void);
+
+int main(int argc, char *argv[]) {
+  int result = wasm_module();
+
+  if (result == 100) {
+    printf("OK Marker\n");
+    return 0;
+  } else {
+    printf("FAIL Marker\n");
+    return 1;
+  }
+}