build: point ocio-sys at the fork carrying the zlib-ng detection fix

The vendored minizip-ng prefers find_package(ZLIBNG) over the classic
zlib the OCIO install scripts pass, so hosts with zlib-ng installed
(Arch) produced zng_* references the vendored zlib cannot satisfy and
the final link failed. Mike-Solar/ocio-rs@ddb677d disables the ZLIBNG
package lookup; the fork main now carries that plus the cstdint fix.

Cargo.lock

@@ -5208,7 +5208,7 @@ dependencies = [
 [[package]]
 name = "ocio-sys"
 version = "0.2.1"
-source = "git+https://github.com/shaloong/ocio-rs.git?branch=main#933c65dc4e8e4e22767174f0e22b07fe7af42e07"
+source = "git+https://github.com/Mike-Solar/ocio-rs.git?branch=main#ddb677d8a71d1047c2dd3f8a04fc88f7c5c23ccc"
 dependencies = [
  "cc",
  "cmake",

Cargo.toml

@@ -68,8 +68,10 @@ debug-assertions = false
 [profile.dev]
 opt-level = 1
 
-# ocio-sys 0.2.1's vendored yaml-cpp misses <cstdint> and fails to build on
-# GCC >= 16; the fork carries exactly that fix (d39c509) until a fixed
-# release lands on crates.io.
+# ocio-sys 0.2.1's vendored sources fail to build on GCC >= 16 (yaml-cpp
+# misses <cstdint>) and misdetect a system zlib-ng (minizip-ng then emits
+# zng_* symbols the vendored zlib cannot satisfy). The fork tracks
+# shaloong/ocio-rs main plus both build fixes; return to the crates.io
+# release once it carries them.
 [patch.crates-io]
-ocio-sys = { git = "https://github.com/shaloong/ocio-rs.git", branch = "main" }
+ocio-sys = { git = "https://github.com/Mike-Solar/ocio-rs.git", branch = "main" }