Commit 591ef31 for zlib

commit 591ef31613a6f37d21d90bd8355b313eaa70a420
Author: Mark Adler <git@madler.net>
Date:   Tue Feb 17 04:35:11 2026 -0800

    Avoid using the value of an undefined macro in crc32.c.

diff --git a/crc32.c b/crc32.c
index 166330d..97eb5fd 100644
--- a/crc32.c
+++ b/crc32.c
@@ -106,7 +106,8 @@
 #endif

 /* If available, use the ARM processor CRC32 instruction. */
-#if defined(__aarch64__) && defined(__ARM_FEATURE_CRC32) && W == 8
+#if defined(__aarch64__) && defined(__ARM_FEATURE_CRC32) && \
+    defined(W) && W == 8
 #  define ARMCRC32
 #endif