netmaker: Fix generating a service constructor with a rest argument

When a rest argument is used in an IDL, it was previously just
generating a single Any argument for the constructor and then trying to
pass that directly to createInstanceWithArgumentsAndContext. That
doesn’t compile because that method requires an array of Anys for the
arguments parameter. Instead this patch makes it generate “params Any[]
rest” which seems to be the .NET way to do variadic arguments.

I don’t think there are any LibreOffice services using constructors with
rest parameters and presumably no one is using it outside of LO with
.NET because it wouldn’t compile, so hopefully this patch has little
risk. Fixing it enables us to use rest parameters in a future unit test
for pyuno.

Change-Id: I7dbf96f945011db546374ae1d6cf904a5bd262ce
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/199135
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@collabora.com>

codemaker/source/netmaker/netproduce.cxx

@@ -1020,11 +1020,14 @@ void NetProducer::produceService(
                 .append("(com.sun.star.uno.XComponentContext ctx");
             if (!ctor.parameters.empty())
                 file.append(", ");
-            separatedForeach(
-                ctor.parameters, [&file]() { file.append(", "); },
-                [this, &file](const auto& p) {
-                    file.append(getNetName(p.type)).append(" ").append(getSafeIdentifier(p.name));
-                });
+            separatedForeach(ctor.parameters, [&file]() { file.append(", "); },
+                             [this, &file, restParam](const auto& p) {
+                                 if (&p == restParam)
+                                     file.append("params ").append(getNetName(p.type)).append("[]");
+                                 else
+                                     file.append(getNetName(p.type));
+                                 file.append(" ").append(getSafeIdentifier(p.name));
+                             });
             file.append(")").endLine().beginBlock();
 
             file.beginLine()