[BETA] macOS support

media/ffvpx/libavutil/x86/x86util_stub.c

@@ -0,0 +1,22 @@
+// Empty stub to satisfy build system on macOS
+#include <stdint.h>
+
+// CPU flags: return 0 (no SIMD)
+int ff_get_cpu_flags_x86(void) {
+    return 0;
+}
+
+// Fixed DSP: do nothing
+void ff_fixed_dsp_init_x86(void *dsp) {
+    (void)dsp;
+}
+
+// Float DSP: do nothing
+void ff_float_dsp_init_x86(void *fdsp) {
+    (void)fdsp;
+}
+
+// LLS init: do nothing
+void ff_init_lls_x86(void *lls) {
+    (void)lls;
+}