add cmake to travis

.travis.yml

@@ -10,7 +10,7 @@ before_script:
 # General toolchain dependencies
   - sudo apt-get install libc6:i386 libgcc1:i386 gcc-4.6-base:i386 libstdc++5:i386 libstdc++6:i386
   - sudo apt-get install python-serial python-argparse
-  - sudo apt-get install flex bison libncurses5-dev autoconf texinfo build-essential libtool zlib1g-dev genromfs git wget
+  - sudo apt-get install flex bison libncurses5-dev autoconf texinfo build-essential libtool zlib1g-dev genromfs git wget cmake
   - pushd .
   - cd ~
   - wget https://launchpadlibrarian.net/174121628/gcc-arm-none-eabi-4_7-2014q2-20140408-linux.tar.bz2

unittests/Makefile

@@ -80,7 +80,7 @@ st24_test: $(ST24_FILES)
 
 cmake_gtests:
 	mkdir -p build
-	cd build && cmake .. && $(MAKE) && $(MAKE) test
+	cd build && CC=gcc cmake .. && $(MAKE) && $(MAKE) test
 
 unittests: clean mixer_test sbus2_test sf0x_test st24_test cmake_gtests
 	./mixer_test