[zlib] Update "Re-sync with zlib 1.2.12, patch 11 of N" for V8

V8 bazel builders failed build due to an unused variable |n| in the
1.2.12 crc32_combine64(crc1, crc2, len2) function. Remove it.

Bug: 1032721
Change-Id: I087dde0d7abd46da5455f3f4844333a31d22c0f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3647250
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Auto-Submit: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1003070}
NOKEYCHECK=True
GitOrigin-RevId: df853fb66127baf3668a1fabbc951860046dadd3
diff --git a/crc32.c b/crc32.c
index 7f23708..142f1e8 100644
--- a/crc32.c
+++ b/crc32.c
@@ -1126,8 +1126,6 @@
     uLong crc2;
     z_off64_t len2;
 {
-    int n;
-
 #ifdef DYNAMIC_CRC_TABLE
     once(&made, make_crc_table);
 #endif /* DYNAMIC_CRC_TABLE */