extlib: update zlib to v1.3.1

iscgar · ruevs · commit 0bf9cbb7e561 · 2025-08-10T22:41:24.000+03:00
This solves an issue with CMake 4.0.0, which doesn't support configs
for versions earlier than 3.5.
diff --git a/extlib/zlib b/extlib/zlib
@@ -1 +1 @@
-Subproject commit 2fa463bacfff79181df1a5270fb67cc679a53e71
+Subproject commit 51b7f2abdade71cd9bb0e7a373ef2610ec6f9daf
