tdf#117918 codemaker: avoid including ourselves in .hpp files

It's pointless, include guards will make sure it's a NOP, but it
confuses tools like IWYU.

Change-Id: Ic1f56ef267954cdf8bf3cb4f4a5e841d5e4bb82a
Reviewed-on: https://gerrit.libreoffice.org/55354Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

codemaker/source/cppumaker/includes.cxx

@@ -161,7 +161,10 @@ void Includes::dump(
             if (m_hpp || pair.second == Dependencies::KIND_BASE
                 || !isInterfaceType(u2b(pair.first)))
             {
-                dumpInclude(out, u2b(pair.first), m_hpp);
+                // If we know our name, then avoid including ourselves.
+                if (!companionHdl || *companionHdl != pair.first) {
+                    dumpInclude(out, u2b(pair.first), m_hpp);
+                }
             } else {
                 bool ns = dumpNamespaceOpen(out, pair.first, false);
                 if (ns) {