Travis does not need manual set of compiler. Enable multilib

.travis.yml

@@ -2,13 +2,10 @@ language: cpp
 compiler: 
   - gcc
   - clang
+sudo: true
+before_script:
+  - sudo apt-get install gcc-multilib g++-multilib 
 script:
   - mkdir -p build && cd build
-  - export CC=gcc
-  - export CXX=g++
-  - cmake ../ -DCMAKE_EXE_LINKER_FLAGS="-Wl,--no-undefined" -DUSE_VOICEMGR=0 && make -j3 && rm -rf *
-  - cmake ../ -DCMAKE_EXE_LINKER_FLAGS="-Wl,--no-undefined" -DUSE_VOICEMGR=1 && make -j3 && rm -rf *
-  - export CC=clang
-  - export CXX=clang++
   - cmake ../ -DCMAKE_EXE_LINKER_FLAGS="-Wl,--no-undefined" -DUSE_VOICEMGR=0 && make -j3 && rm -rf *
   - cmake ../ -DCMAKE_EXE_LINKER_FLAGS="-Wl,--no-undefined" -DUSE_VOICEMGR=1 && make -j3 && rm -rf *