Use Travis build matrix to test different platforms

Create a clean, minimal, cross-platform Travis script with a build
matrix for testing different operating systems and architectures.

.travis.sh

@@ -1,26 +0,0 @@
-#!/bin/sh
-set -eux
-
-case "$TARGET" in
-host)
-	uname -a
-	export LOADER=
-	make ;;
-arm32)
-	sudo bash -c 'echo >> /etc/apt/sources.list "deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe"'
-	sudo apt-get update
-	sudo apt-get -y install gcc-4.7-arm-linux-gnueabihf qemu binfmt-support
-	make CC="arm-linux-gnueabihf-gcc-4.7"
-	export LD_LIBRARY_PATH=/usr/arm-linux-gnueabihf/lib
-	#export LOADER=/usr/arm-linux-gnueabihf/lib/ld-linux-armhf.so.3
-	export LOADER="echo TESTS DISABLED ON ARM"
-	;;
-*)
-	echo 'Unknown TARGET!'
-	exit 1
-	;;
-esac
-
-$LOADER make check
-
-make clean && git status --ignored --porcelain && test -z "$(git status --ignored --porcelain)"

.travis.yml

@@ -1,13 +1,16 @@
+sudo: required
+dist: trusty
 language: c
-script: ./.travis.sh
-os:
-    - linux
-env:
-    - TARGET=host
-    - TARGET=arm32
+
+script:
+    - make $FLAGS
+    - make check $FLAGS
+    - make clean && git status --ignored --porcelain && test -z "$(git status --ignored --porcelain)"
+
 matrix:
-    exclude:
-        - os: osx
-          env: TARGET=arm32
+    include:
+        - os: linux
+          env: FLAGS="CC=gcc"
+
 notifications:
     email: false