Silence clang-cl -Werror,-Wundef in workdir/UnpackedTarball/gpgmepp/ includes

> workdir/UnpackedTarball/libgpg-error/src\gpg-error.h(709,5):  error: '__GNUC__' is not defined, evaluates to 0 [-Werror,-Wundef]
> #if __GNUC__
>     ^
> 1 error generated.

Change-Id: Icae46745069431e60faa7d2e6ca44ab800e72b95
Reviewed-on: https://gerrit.libreoffice.org/45341
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>

xmlsecurity/source/gpg/CertificateImpl.hxx

@@ -26,7 +26,14 @@
 #include <com/sun/star/security/CertificateKind.hpp>
 #include <com/sun/star/security/XCertificate.hpp>
 
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundef"
+#endif
 #include <key.h>
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
 
 class CertificateImpl : public cppu::WeakImplHelper< css::security::XCertificate,
                                                      css::lang::XUnoTunnel >,

xmlsecurity/source/gpg/SecurityEnvironment.hxx

@@ -24,7 +24,14 @@
 #include <com/sun/star/security/CertificateValidity.hpp>
 #include <com/sun/star/lang/XUnoTunnel.hpp>
 
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundef"
+#endif
 #include <gpgme.h>
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
 #include <context.h>
 
 class SecurityEnvironmentGpg : public cppu::WeakImplHelper< css::xml::crypto::XSecurityEnvironment,

xmlsecurity/source/gpg/xmlsignature_gpgimpl.cxx

@@ -22,7 +22,14 @@
 #include <cppuhelper/supportsservice.hxx>
 #include <gpg/xmlsignature_gpgimpl.hxx>
 
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundef"
+#endif
 #include <gpgme.h>
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
 #include <context.h>
 #include <key.h>
 #include <data.h>