Get string operations working on 3ds

Shared/source/shims.c

@@ -0,0 +1,18 @@
+#include <stdlib.h>
+#include <malloc.h>
+#include <errno.h>
+
+int posix_memalign(void **res, size_t align, size_t len) {
+    if (align < sizeof(void *)) return 22;
+    void *mem = memalign(align, len);
+    if (!mem) return errno;
+    *res = mem;
+    return 0;
+}
+
+int getentropy(void *buffer, size_t length) {
+    for (int i = 0; i < length; i++) {
+        ((int*)buffer)[i] = rand();
+    }
+    return 0;
+}