Merge pull request #2940 from lioncash/zlib

externals: Track mainline zlib as a submodule

.ci/scripts/linux/docker.sh

@@ -11,4 +11,5 @@ ninja
 
 ccache -s
 
-ctest -VV -C Release
+# Ignore zlib's tests, since they aren't gated behind a CMake option.
+ctest -VV -E "(example|example64)" -C Release

.gitmodules

@@ -47,8 +47,8 @@
     path = externals/sirit
     url = https://github.com/ReinUsesLisp/sirit
 [submodule "libzip"]
-	path = externals/libzip
-	url = https://github.com/DarkLordZach/libzip
+    path = externals/libzip
+    url = https://github.com/DarkLordZach/libzip
 [submodule "zlib"]
-	path = externals/zlib
-	url = https://github.com/DarkLordZach/zlib
+    path = externals/zlib
+    url = https://github.com/madler/zlib

externals/CMakeLists.txt

@@ -77,11 +77,11 @@ if (ENABLE_VULKAN)
     add_subdirectory(sirit)
 endif()
 
-# libzip
-add_subdirectory(libzip)
-
 # zlib
-add_subdirectory(zlib)
+add_subdirectory(zlib EXCLUDE_FROM_ALL)
+
+# libzip
+add_subdirectory(libzip EXCLUDE_FROM_ALL)
 
 if (ENABLE_WEB_SERVICE)
     # LibreSSL