fix(build): update iOS make command to use 'isim' platform for compatibility

Author: Gioee

.github/workflows/main.yml

@@ -52,7 +52,7 @@ jobs:
 
           - os: macos-latest
             name: ios
-            make: PLATFORM=ios LLAMA="-DGGML_METAL=ON -DGGML_ACCELERATE=ON -DGGML_BLAS=ON -DGGML_BLAS_VENDOR=Apple" WHISPER="-DGGML_METAL=ON -DGGML_ACCELERATE=ON -DGGML_BLAS=ON -DGGML_BLAS_VENDOR=Apple -DWHISPER_COREML=ON -DWHISPER_COREML_ALLOW_FALLBACK=ON"
+            make: PLATFORM=isim LLAMA="-DGGML_METAL=ON -DGGML_ACCELERATE=ON -DGGML_BLAS=ON -DGGML_BLAS_VENDOR=Apple" WHISPER="-DGGML_METAL=ON -DGGML_ACCELERATE=ON -DGGML_BLAS=ON -DGGML_BLAS_VENDOR=Apple -DWHISPER_COREML=ON -DWHISPER_COREML_ALLOW_FALLBACK=ON"
 
     defaults:
       run: