Fix Firebird installation on xenial

Author: hazzik

.travis.yml

@@ -7,7 +7,11 @@ services:
   - postgresql
   - docker
 env:
+  - DB=SqlServer2008 CONNECTION_STRING="Server=localhost;initial catalog=nhibernate;User Id=sa;Password=P@ssw0rd;packet size=4096;"
+  - DB=PostgreSQL CONNECTION_STRING="Host=localhost;Port=5432;Username=postgres;Database=nhibernate;Enlist=true;"
+  - DB=Firebird 
   - DB=MySQL CONNECTION_STRING="Server=127.0.0.1;Uid=root;Database=nhibernate;Old Guids=True;"   
+  - DB=SQLite 
 before_install:
   - curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
   - curl https://packages.microsoft.com/config/ubuntu/14.04/prod.list | sudo tee /etc/apt/sources.list.d/microsoft.list
@@ -22,8 +26,9 @@ before_install:
   - |-
     if [[ "$DB" == "Firebird" ]]
     then
-      sudo apt-get install -y libicu-dev libtommath-dev curl
-      curl -L -O https://github.com/FirebirdSQL/firebird/releases/download/R3_0_5/Firebird-3.0.5.33220-0.amd64.tar.gz
+      sudo apt-get install -y libicu-dev libtommath-dev
+      sudo ln -s /usr/lib/x86_64-linux-gnu/libtommath.so.1 /usr/lib/x86_64-linux-gnu/libtommath.so.0
+      wget -q https://github.com/FirebirdSQL/firebird/releases/download/R3_0_5/Firebird-3.0.5.33220-0.amd64.tar.gz
       tar xzvf Firebird-3.0.5.33220-0.amd64.tar.gz
       pushd Firebird-3.0.5.33220-0.amd64
         sudo ./install.sh -silent