Fix: updated required extensions (#5099)

* Fix: updated required extensions

- mysqli is used in Varien, spl is used in install.xml

* Fix: updated required extensions

- mysqli is used in Varien, spl is used in install.xml

Author: sreichel

app/code/core/Mage/Install/etc/install.xml

@@ -75,8 +75,10 @@
                     <openssl/>
                     <mcrypt/>
                 </mcrypt>
+                <mysqli/>
                 <pdo/>
                 <pdo_mysql/>
+                <posix/>
                 <simplexml/>
                 <soap/>
                 <spl/>

composer.json

@@ -20,11 +20,13 @@
         "ext-json": "*",
         "ext-libxml": "*",
         "ext-mbstring": "*",
+        "ext-mysqli": "*",
         "ext-pdo": "*",
         "ext-pdo_mysql": "*",
         "ext-posix": "*",
         "ext-simplexml": "*",
         "ext-soap": "*",
+        "ext-spl": "*",
         "ext-zlib": "*",
         "composer-runtime-api": "^2",
         "colinmollenhour/cache-backend-redis": "^1.14",