fix exe and dll code signing

Better error handling for code signing with curl and we're now using the correct URL for windows files (there are different URLs for JARs, Windows and for Mac).

See also https://wiki.eclipse.org/IT_Infrastructure_Doc#Web_service

ci/Jenkinsfile

@@ -28,9 +28,12 @@ pipeline {
           }
 
           dir('native/target/x86_64-pc-windows-gnu/release') {
-            sh 'curl -o chromium_subp.exe -F file=@chromium_subp.exe https://cbi.eclipse.org/jarsigner/sign'
-            sh 'curl -o chromium_jni.dll -F file=@chromium_jni.dll https://cbi.eclipse.org/jarsigner/sign'
-            stash name: 'rust_binaries', includes: 'chromium_subp.exe, chromium_jni.dll', useDefaultExcludes: false
+            sh 'mkdir -p signed'
+            sh 'curl --output signed/chromium_subp.exe --form file=@chromium_subp.exe --silent --show-error --fail https://cbi.eclipse.org/authenticode/sign'
+            sh 'curl --output signed/chromium_jni.dll --form file=@chromium_jni.dll --silent --show-error --fail https://cbi.eclipse.org/authenticode/sign'
+            dir('signed') {
+              stash name: 'rust_binaries', includes: 'chromium_subp.exe, chromium_jni.dll', useDefaultExcludes: false
+            }
           }
         }
       }