pkp/pkp-lib#6888 Exclude example code from distribution package

tools/buildpkg.sh

@@ -49,6 +49,7 @@ lib/pkp/lib/vendor/alex198710/pnotify/.git						\
 lib/pkp/lib/vendor/sebastian								\
 lib/pkp/lib/vendor/oyejorge/less.php/test						\
 lib/pkp/tools/travis									\
+plugins/paymethod/paypal/vendor/clue/stream-filter/examples				\
 plugins/paymethod/paypal/vendor/omnipay/common/tests/					\
 plugins/paymethod/paypal/vendor/omnipay/paypal/tests/					\
 plugins/paymethod/paypal/vendor/guzzle/guzzle/docs/					\
@@ -74,6 +75,7 @@ plugins/generic/citationStyleLanguage/lib/vendor/satooshi/php-coveralls/tests/
 plugins/generic/citationStyleLanguage/lib/vendor/guzzle/guzzle/tests/			\
 plugins/generic/citationStyleLanguage/lib/vendor/seboettg/collection/tests/		\
 plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/tests/		\
+plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/example/		\
 lib/pkp/lib/vendor/nikic/fast-route/test/						\
 lib/pkp/lib/vendor/ezyang/htmlpurifier/tests/						\
 lib/pkp/lib/vendor/ezyang/htmlpurifier/smoketests/					\
@@ -83,6 +85,7 @@ lib/pkp/lib/vendor/phpmailer/phpmailer/test/						\
 lib/pkp/lib/vendor/swiftmailer/swiftmailer/tests/					\
 lib/pkp/lib/vendor/dragonmantank/cron-expression/tests/					\
 lib/pkp/lib/vendor/cweagans/composer-patches/tests/					\
+lib/pkp/lib/vendor/moxiecode/plupload/examples/						\
 node_modules										\
 .editorconfig										\
 babel.config.js										\