os.notify: fix struct epoll_event alignment on ARM64/Linux (fix #25778) (#25779)

Author: kbkpbot

vlib/os/notify/epoll.h

@@ -1,6 +1,12 @@
 // NOTE: tcc does not support yet __attribute__ ((__packed__)) properly, 
 // so the __EPOLL_PACKED macro that /usr/include/bits/epoll.h uses does not work :-| .
 // However, it *does support* the older `#pragma pack(push, 1)`
+#if defined(__TINYC__) && defined(__V_amd64)
 #pragma pack(push, 1)
+#endif
+
 #include <sys/epoll.h>
+
+#if defined(__TINYC__) && defined(__V_amd64)
 #pragma pack(pop)
+#endif