Rename os memory functions

src/os/mem/posix/mem_os_posix.c

@@ -18,7 +18,7 @@ wapp_intern const i32 access_types[] = {
 	[WAPP_MEM_ACCESS_READ_WRITE_EXEC]	= PROT_READ | PROT_WRITE | PROT_EXEC,
 };
 
-void *mem_util_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type) {
+void *os_mem_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type) {
 	(void)type;
 	i32 alloc_flags = flags | MAP_ANON | MAP_PRIVATE;
 
@@ -29,7 +29,7 @@ void *mem_util_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags fl
 	return mmap(addr, size, access_types[access], alloc_flags, -1, 0);
 }
 
-void mem_util_free(void *ptr, u64 size) {
+void os_mem_free(void *ptr, u64 size) {
 	munmap(ptr, size);
 }