Use iOS securePtrOverwriteAndFree implementation for all Apple platforms

0_apple.go

@@ -0,0 +1,14 @@
+//go:build ios || darwin
+
+package main
+
+// #include <string.h>
+// #include <stdlib.h>
+import "C"
+import "unsafe"
+
+// securePtrOverwriteAndFree securely overwrites the memory at the input pointer and then frees it.
+func securePtrOverwriteAndFree(input unsafe.Pointer, length C.size_t) {
+	C.memset_s(input, length, 0, length)
+	C.free(input)
+}