mmap : skip resource limit checks on AIX (#12541)

Author: mehendarkarprajwal

src/llama-mmap.cpp

@@ -476,7 +476,7 @@ struct llama_mlock::impl {
 
         char* errmsg = std::strerror(errno);
         bool suggest = (errno == ENOMEM);
-#if defined(TARGET_OS_VISION) || defined(TARGET_OS_TV)
+#if defined(TARGET_OS_VISION) || defined(TARGET_OS_TV) || defined(_AIX)
         // visionOS/tvOS dont't support RLIMIT_MEMLOCK
         // Skip resource limit checks on visionOS/tvOS
         suggest = false;