Fix failing build process because of glibc version

Building the whole project with `dotnet publish -c Release --os win`
would fail with the message "glibc version 2.25 not found" this was
related to caching problems while compiling the build script and a
workaround is specifying a different target directory for each target
that should be build.

See also the following issues for more details about the problem:

- cross-rs/cross#988
- cross-rs/cross#724

.gitignore

@@ -453,3 +453,7 @@ documentation-build
 
 # Automatically generated native library bindings
 AKL.Common/bindings
+
+# Custom target directories for core system lib
+akl-core-system-lib/build-win
+akl-core-system-lib/build-linux

AKL.Common/AKL.Common.csproj

@@ -26,9 +26,9 @@
 
   <Target Name="BuildNativeLibrary" BeforeTargets="PrepareForBuild">
     <!-- Crosscompile native lib for windows and linux -->
-    <Exec Command="cross build --release --target x86_64-pc-windows-gnu"
+    <Exec Command="cross build --release --target x86_64-pc-windows-gnu --target-dir build-win"
       WorkingDirectory="$(MSBuildProjectDirectory)/../akl-core-system-lib" /> 
-    <Exec Command="cross build --release --target x86_64-unknown-linux-gnu"
+    <Exec Command="cross build --release --target x86_64-unknown-linux-gnu --target-dir build-linux"
       WorkingDirectory="$(MSBuildProjectDirectory)/../akl-core-system-lib" /> 
 
     <!-- Copy generated bindings from the native lib -->
@@ -37,12 +37,12 @@
 
     <!-- Include native dynamic librarys as output files -->
     <ItemGroup>
-      <Content Include="../akl-core-system-lib/target/x86_64-pc-windows-gnu/release/*.dll">
+      <Content Include="../akl-core-system-lib/build-win/x86_64-pc-windows-gnu/release/*.dll">
           <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
           <PublishState>Included</PublishState>
           <ExcludeFromSingleFile>true</ExcludeFromSingleFile>
       </Content>
-      <Content Include="../akl-core-system-lib/target/x86_64-unknown-linux-gnu/release/*.so">
+      <Content Include="../akl-core-system-lib/build-linux/x86_64-unknown-linux-gnu/release/*.so">
           <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
           <PublishState>Included</PublishState>
           <ExcludeFromSingleFile>true</ExcludeFromSingleFile>

clean-output.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env sh
 
+rm -rf ./akl-core-system-lib/build-win
+rm -rf ./akl-core-system-lib/build-linux
 rm -rf ./akl-core-system-lib/target
 rm -rf ./akl-native-lib-prototype/target