whisper: unbreak destroot without metal

Author: barracuda156

audio/whisper/Portfile

@@ -91,15 +91,17 @@ destroot {
 
 post-destroot {
     xinstall -d ${destroot}${prefix}/share/whisper/ggml
-    xinstall ${workpath}/build/bin/ggml-metal.metal ${destroot}${prefix}/share/whisper/ggml
-    xinstall ${workpath}/build/bin/ggml-common.h ${destroot}${prefix}/share/whisper/ggml
     xinstall -d ${destroot}${prefix}/lib
     xinstall ${workpath}/build/src/libwhisper.${version}.dylib ${destroot}${prefix}/lib/libwhisper.1.dylib
     xinstall ${workpath}/build/ggml/src/libggml.dylib ${destroot}${prefix}/lib/libggml.dylib
     xinstall ${workpath}/build/ggml/src/libggml-cpu.dylib ${destroot}${prefix}/lib/libggml-cpu.dylib
     xinstall ${workpath}/build/ggml/src/libggml-base.dylib ${destroot}${prefix}/lib/libggml-base.dylib
     xinstall ${workpath}/build/ggml/src/ggml-blas/libggml-blas.dylib ${destroot}${prefix}/lib/libggml-blas.dylib
-    xinstall ${workpath}/build/ggml/src/ggml-metal/libggml-metal.dylib ${destroot}${prefix}/lib/libggml-metal.dylib
+    if {${os.platform} eq "darwin" && ${os.subplatform} eq "macosx" && ${os.major} >= 15} {
+        xinstall ${workpath}/build/bin/ggml-metal.metal ${destroot}${prefix}/share/whisper/ggml
+        xinstall ${workpath}/build/bin/ggml-common.h ${destroot}${prefix}/share/whisper/ggml
+        xinstall ${workpath}/build/ggml/src/ggml-metal/libggml-metal.dylib ${destroot}${prefix}/lib/libggml-metal.dylib
+    }
 }