Include libz.a in native aot packages (#106673)

Fixes #106566

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets

@@ -24,7 +24,7 @@ The .NET Foundation licenses this file to you under the MIT license.
     <LinkerFlavor Condition="'$(LinkerFlavor)' == '' and '$(_linuxLibcFlavor)' == 'bionic'">lld</LinkerFlavor>
     <LinkerFlavor Condition="'$(LinkerFlavor)' == '' and '$(_targetOS)' == 'linux'">bfd</LinkerFlavor>
     <IlcDefaultStackSize Condition="'$(IlcDefaultStackSize)' == '' and '$(_linuxLibcFlavor)' == 'musl'">1572864</IlcDefaultStackSize>
-    <UseSystemZlib Condition="'$(UseSystemZlib)' == '' and !Exists('$(IlcFrameworkNativePath)libz.a')">true</UseSystemZlib>
+    <UseSystemZlib Condition="'$(UseSystemZlib)' == '' and !Exists('$(IlcSdkPath)libz.a')">true</UseSystemZlib>
   </PropertyGroup>
 
   <Target Name="SetupOSSpecificProps" DependsOnTargets="$(IlcDynamicBuildPropertyDependencies)">
@@ -136,7 +136,6 @@ The .NET Foundation licenses this file to you under the MIT license.
       <NetCoreAppNativeLibrary Include="System.Native" />
       <NetCoreAppNativeLibrary Include="System.Globalization.Native" Condition="'$(StaticICULinking)' != 'true' and '$(InvariantGlobalization)' != 'true'" />
       <NetCoreAppNativeLibrary Include="System.IO.Compression.Native" />
-      <NetCoreAppNativeLibrary Include="z" Condition="'$(UseSystemZlib)' != 'true'" /> <!-- zlib must be added after System.IO.Compression.Native, order matters. -->
       <NetCoreAppNativeLibrary Include="System.Net.Security.Native" Condition="!$(_targetOS.StartsWith('tvos')) and '$(_linuxLibcFlavor)' != 'bionic'" />
       <NetCoreAppNativeLibrary Include="System.Security.Cryptography.Native.Apple" Condition="'$(_IsApplePlatform)' == 'true'" />
       <!-- Not compliant for iOS-like platforms -->
@@ -151,6 +150,11 @@ The .NET Foundation licenses this file to you under the MIT license.
       <NativeLibrary Include="@(NetCoreAppNativeLibrary->'%(EscapedPath)')" />
     </ItemGroup>
 
+    <ItemGroup>
+      <!-- zlib must be added after System.IO.Compression.Native, order matters. -->
+      <NativeLibrary Condition="'$(UseSystemZlib)' != 'true'" Include="$(IlcSdkPath)libz.a" />
+    </ItemGroup>
+
     <ItemGroup Condition="'$(StaticICULinking)' == 'true' and '$(NativeLib)' != 'Static' and '$(InvariantGlobalization)' != 'true'">
       <NativeLibrary Include="$(IntermediateOutputPath)libs/System.Globalization.Native/build/libSystem.Globalization.Native.a" />
       <DirectPInvoke Include="libSystem.Globalization.Native" />

src/native/libs/System.IO.Compression.Native/CMakeLists.txt

@@ -184,12 +184,7 @@ else ()
 endif ()
 
 if((NOT CLR_CMAKE_USE_SYSTEM_ZLIB) AND STATIC_LIBS_ONLY)
-    if (CLR_CMAKE_TARGET_UNIX)
-        # zlib on Unix needs to be installed in the same location as System.IO.Compression.Native so that we can then treat is as a 'z' native library.
-        install_static_library(zlib ${STATIC_LIB_DESTINATION} nativeaot)
-    else()
-        install_static_library(zlib aotsdk nativeaot)
-    endif()
+    install_static_library(zlib aotsdk nativeaot)
 endif()
 
 install (TARGETS System.IO.Compression.Native-Static DESTINATION ${STATIC_LIB_DESTINATION} COMPONENT libs)