travis: Split build scripts for different platforms

This commit also separates clang-format from the linux build, closing #2702.

.travis/linux/build.sh

@@ -0,0 +1,3 @@
+#!/bin/bash -ex
+
+docker run -v $(pwd):/citra ubuntu:16.04 /bin/bash /citra/.travis/linux/docker.sh

.travis/linux/deps.sh

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+#!/bin/sh -ex
+
+docker pull ubuntu:16.04

.travis/linux/docker.sh

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+#!/bin/bash -ex
+
+cd /citra
+
+apt-get update
+apt-get install -y build-essential libsdl2-dev qtbase5-dev libqt5opengl5-dev libcurl4-openssl-dev libssl-dev wget git
+
+# 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

.travis/linux/upload.sh

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+#!/bin/bash -ex
+
+. .travis/common/pre-upload.sh
+
+REV_NAME="citra-linux-${GITDATE}-${GITREV}"
+ARCHIVE_NAME="${REV_NAME}.tar.xz"
+COMPRESSION_FLAGS="-cJvf"
+
+mkdir "$REV_NAME"
+
+cp build/src/citra/citra "$REV_NAME"
+cp build/src/citra_qt/citra-qt "$REV_NAME"
+
+. .travis/common/post-upload.sh