travis: Add build with frozen versions for dependencies

.travis/linux-frozen/docker.sh

@@ -0,0 +1,27 @@
+#!/bin/bash -ex
+
+cd /citra
+
+apt-get update
+apt-get install -y build-essential wget git python-launchpadlib libssl-dev
+
+# Install specific versions of packages with their dependencies
+# The apt repositories remove older versions regularly, so we can't use
+# apt-get and have to pull the packages directly from the archives.
+/citra/.travis/linux-frozen/install_package.py       \
+    libsdl2-dev 2.0.4+dfsg1-2ubuntu2 xenial          \
+    qtbase5-dev 5.2.1+dfsg-1ubuntu14.3 trusty        \
+    libqt5opengl5-dev 5.2.1+dfsg-1ubuntu14.3 trusty  \
+    libcurl4-openssl-dev 7.47.0-1ubuntu2.3 xenial    \
+    libicu52 52.1-3ubuntu0.6 trusty
+
+# Get a recent version of CMake
+wget https://cmake.org/files/v3.9/cmake-3.9.0-Linux-x86_64.sh
+echo y | sh cmake-3.9.0-Linux-x86_64.sh --prefix=cmake
+export PATH=/citra/cmake/cmake-3.9.0-Linux-x86_64/bin:$PATH
+
+mkdir build && cd build
+cmake .. -DUSE_SYSTEM_CURL=ON -DCMAKE_BUILD_TYPE=Release
+make -j4
+
+ctest -VV -C Release