remove php5 packages from webmail.sh

The PHP5 packages have a dependency on (apache2 or php5-cgi or php5-fpm), and since removing php5-fpm apache2 started getting installed during setup, which caused a conflict with nginx of course.

These packages don't seem to be needed by Roundcube or Nextcloud --- Roundcube includes the ones it needs.

see #1264, #1298

CHANGELOG.md

@@ -23,6 +23,7 @@ Installer:
 
 * We now run `apt-get autoremove` at the start of setup to clear out old packages, especially old kernels that take up a lot of space. On the first run, this step may take a long time.
 * We now fetch Z-Push from their tagged git repository, fixing an installation problem.
+* Some old PHP5 packages are removed from setup, fixing an installation bug where Apache would get installed.
 
 v0.25 (November 15, 2017)
 -------------------------

setup/webmail.sh

@@ -23,7 +23,6 @@ echo "Installing Roundcube (webmail)..."
 apt_install \
 	dbconfig-common \
 	php7.0-cli php7.0-sqlite php7.0-mcrypt php7.0-intl php7.0-json php7.0-common \
-	php-auth php-net-smtp php-net-socket php-net-sieve php-mail-mime php-crypt-gpg \
 	php7.0-gd php7.0-pspell tinymce libjs-jquery libjs-jquery-mousewheel libmagic1 php7.0-mbstring
 
 apt_get_quiet remove php-mail-mimedecode # no longer needed since Roundcube 1.1.3