(Vagrantfile) update to V8 7.5

Vagrantfile

@@ -8,18 +8,13 @@
 Vagrant.configure("2") do |config|
   # Every Vagrant development environment requires a box. You can search for
   # boxes at https://atlas.hashicorp.com/search.
-  config.vm.box = "ubuntu/xenial64"
+  config.vm.box = "ubuntu/bionic64"
-
-  config.vm.provider "lxc" do |lxc, override|
-    lxc.backingstore = "none"
-    override.vm.box = "zaikin/xenial64-lxc"
-  end
 
 
   #
   # mass-define "generic" Ubuntu boxes
   #
-  %w{7.1}.each { |version|
+  %w{7.5}.each { |version|
     config.vm.define "v8-#{version}" do |i|
       i.vm.synced_folder ".", "/data/v8js"
 
@@ -82,94 +77,6 @@ Vagrant.configure("2") do |config|
     end
   }
 
-
-  #
-  # Fedora-based box with GCC7, V8 5.2 + PHP 7.1 installed
-  # (primarily to reproduce #294)
-  #
-  config.vm.define "fedora-26-gcc7" do |i|
-    i.vm.box = "vbenes/fedora-rawhide-server"
-    i.ssh.insert_key = false
-
-    # unfortunately vboxsf isn't currently available (due to an issue with the base image)
-    # therefore fall back to nfs
-    i.vm.synced_folder ".", "/data/v8js", type: "nfs"
-    i.vm.network "private_network", ip: "192.168.50.2"
-
-    i.vm.provision "shell", inline: <<-SHELL
-      dnf -y update
-      dnf -y install gcc-c++ gdb tmux git tig curl vim
-      dnf -y install v8-devel php-devel
-    SHELL
-  end
-
-
-  #
-  # FreeBSD 11.0 box
-  # (compiles V8 5.1.281.47 with Gyp; using port from https://raw.githubusercontent.com/Kronuz/Xapiand/master/contrib/freebsd/v8.shar)
-  #
-  config.vm.define "freebsd-11" do |i|
-    i.vm.box = "freebsd/FreeBSD-11.0-RELEASE-p1"
-    i.ssh.shell = "/bin/sh"
-
-    # vboxsf doesn't work on FreeBSD (yet), use nfs
-    i.vm.synced_folder ".", "/data/v8js", type: "nfs"
-    i.vm.network "private_network", type: "dhcp"
-
-    i.vm.provision "shell", inline: <<-SHELL
-      pkg install -y git python bash gmake icu gdb tmux git tig curl vim autoconf php70
-
-      portsnap auto --interactive
-
-      mkdir -p /data && cd /data
-      [ -x v8 ] || curl https://raw.githubusercontent.com/Kronuz/Xapiand/master/contrib/freebsd/v8.shar | sh
-
-      cd /data/v8
-      make install
-    SHELL
-  end
-
-
-  #
-  # Fedora 25 box with 32-bit
-  #
-  config.vm.define "fedora25-32" do |i|
-    i.vm.box = "wholebits/fedora25-32"
-    i.vm.synced_folder ".", "/data/v8js"
-
-    i.vm.provision "shell", inline: <<-SHELL
-      dnf -y update
-      dnf -y install gcc-c++ gdb tmux git tig curl vim
-      dnf -y install v8-devel php-devel
-    SHELL
-  end
-
-  config.vm.define "macos-sierra" do |i|
-    i.vm.box = "gobadiah/macos-sierra"
-
-    i.vm.synced_folder ".", "/data/v8js", type: "nfs", mount_options:["resvport"]
-    i.vm.network "private_network", ip: "192.168.50.3"
-
-    i.vm.provider "virtualbox" do |vb|
-      vb.memory = "3000"
-
-      vb.customize ["modifyvm", :id, "--cpuidset", "1","000106e5","00100800","0098e3fd","bfebfbff"]
-      vb.customize ["setextradata", :id, "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct", "iMac11,3"]
-      vb.customize ["setextradata", :id, "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion", "1.0"]
-      vb.customize ["setextradata", :id, "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct", "Iloveapple"]
-      vb.customize ["setextradata", :id, "VBoxInternal/Devices/smc/0/Config/DeviceKey", "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"]
-      vb.customize ["setextradata", :id, "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC", 1]
-    end
-
-    i.vm.provision "shell", privileged: false, inline: <<-SHELL
-      # install homebrew
-      /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
-      brew install autoconf
-      brew install homebrew/php/php71
-      brew install v8
-    SHELL
-  end
-
   config.vm.provision "shell", privileged: false, inline: <<-SHELL
     sudo mkdir -p /data/build && sudo chown $USER:$USER /data/build
   SHELL