update headers to Filament v1.25.0

ios/include/utils/memalign.h

@@ -30,15 +30,13 @@
 namespace utils {
 
 inline void* aligned_alloc(size_t size, size_t align) noexcept {
+    // 'align' must be a power of two and a multiple of sizeof(void*)
+    align = (align < sizeof(void*)) ? sizeof(void*) : align;
     assert(align && !(align & align - 1));
+    assert((align % sizeof(void*)) == 0);
 
     void* p = nullptr;
 
-    // must be a power of two and >= sizeof(void*)
-    while (align < sizeof(void*)) {
-        align <<= 1u;
-    }
-
 #if defined(WIN32)
     p = ::_aligned_malloc(size, align);
 #else