Merge "build: Don't install symfony/polyfill-* that we require"

diff --combined composer.json
index 2aceca8,ecf5df3..845101d
--- 1/composer.json
--- 2/composer.json
+++ b/composer.json
@@@ -27,7 -27,7 +27,7 @@@
                "ext-xml": "*",
                "guzzlehttp/guzzle": "6.3.3",
                "liuggio/statsd-php-client": "1.0.18",
 -              "oojs/oojs-ui": "0.30.1",
 +              "oojs/oojs-ui": "0.30.2",
                "pear/mail": "1.4.1",
                "pear/mail_mime": "1.10.2",
                "pear/net_smtp": "1.8.0",
@@@ -76,6 -76,10 +76,10 @@@
                "wikimedia/testing-access-wrapper": "~1.0",
                "wmde/hamcrest-html-matchers": "^0.1.0"
        },
+       "replace": {
+               "symfony/polyfill-ctype": "1.99",
+               "symfony/polyfill-mbstring": "1.99"
+       },
        "suggest": {
                "ext-apcu": "Local data cache for greatly improved performance",
                "ext-curl": "Improved http communication abilities",