tdf#146619 Drop unused 'using namespace' in: xmlsecurity/

Change-Id: I95b84eff5d8bb288aa704620db328d89062efdf4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165689
Tested-by: Jenkins
Reviewed-by: Gabor Kelemen <gabor.kelemen.extern@allotropia.de>

xmlsecurity/source/gpg/CipherContext.cxx

@@ -11,7 +11,6 @@
 
 using namespace css;
 using namespace css::uno;
-using namespace css::lang;
 
 Sequence<sal_Int8>
     SAL_CALL CipherContext::convertWithCipherContext(const Sequence<sal_Int8>& /*aData*/)

xmlsecurity/source/gpg/DigestContext.cxx

@@ -11,7 +11,6 @@
 
 using namespace css;
 using namespace css::uno;
-using namespace css::lang;
 
 void SAL_CALL DigestContext::updateDigest(const Sequence<sal_Int8>& /*aData*/) {}
 

xmlsecurity/source/gpg/XMLEncryption.cxx

@@ -11,7 +11,6 @@
 
 using namespace css::uno;
 using namespace css::lang;
-using namespace css::xml::wrapper;
 using namespace css::xml::crypto;
 
 XMLEncryptionGpg::XMLEncryptionGpg() {