improve run cmd

MAKE.bat

@@ -831,12 +831,16 @@ if not "!other!"=="" (
 )
 
 if "!run!"=="yes" (
+    if "!rc!"=="1" (
+        echo build failed. skipping run!
+    ) else (
         set exename=hello.exe
         if not "!other!"=="" (
             for /f "tokens=*" %%a in ("!other!") do set exename=%%~na.exe
         )
         echo run !exename! !run_args!
         !exename! !run_args! || set rc=1
+    )
 )
 
 rem PAUSE only if double-clicked from Windows explorer

demos/99-cart.c

@@ -12,7 +12,6 @@ int main() {
     window_title(__FILE__);
 
     camera_t cam = camera();
-
     vec3 route[] = {
         vec3(0.0f, 0.0f, 5.0f),
         vec3(0.0f, 0.0f, 10.0f),