Install solr from source against php71

This is basically a backport of moodlehq#58 that was applied
to php72 and up.

The problem was detected @ moodlehq/moodle-docker#134 (comment)

Author: stronk7

root/tmp/setup/php-extensions.sh

@@ -59,12 +59,8 @@ docker-php-ext-configure ldap --with-libdir=lib/x86_64-linux-gnu/
 docker-php-ext-install -j$(nproc) ldap
 
 # Memcached, MongoDB, Redis, APCu, igbinary.
-pecl install memcached mongodb redis apcu igbinary
-docker-php-ext-enable memcached redis apcu igbinary
-
-# ZIP
-docker-php-ext-configure zip --with-libzip
-docker-php-ext-install zip
+pecl install memcached mongodb redis apcu igbinary uuid
+docker-php-ext-enable memcached mongodb redis apcu igbinary uuid
 
 echo 'apc.enable_cli = On' >> /usr/local/etc/php/conf.d/docker-php-ext-apcu.ini
 
@@ -90,11 +86,6 @@ docker-php-ext-enable sqlsrv
 #   - https://github.com/moodlehq/moodle-php-apache/issues/19 (awaiting for a better solution)
 /tmp/setup/solr-extension.sh
 
-# Install Microsoft dependencies for sqlsrv.
-# (kept apart for clarity, still need to be run here
-# before some build packages are deleted)
-/tmp/setup/sqlsrv-extension.sh
-
 # Keep our image size down..
 pecl clear-cache
 apt-get remove --purge -y $BUILD_PACKAGES