use sudo: required and dist: trusty on Travis

may help with #11553 ?

[av skip]

Update libunwind7 to libunwind8, build openlibm from source

.travis.yml

@@ -5,6 +5,8 @@ os:
 env:
     - ARCH="i686"
     - ARCH="x86_64"
+sudo: required
+dist: trusty
 matrix:
   exclude:
     - os: osx
@@ -23,10 +25,11 @@ notifications:
 before_install:
     - make check-whitespace
     - if [ `uname` = "Linux" ]; then
+        sudo apt-get update -qq -y;
         sudo apt-get install jq -y;
         contrib/travis_fastfail.sh || exit 1;
         BUILDOPTS="-j3 USEGCC=1 LLVM_CONFIG=llvm-config-3.3 VERBOSE=1 USE_BLAS64=0 FORCE_ASSERTIONS=1 STAGE2_DEPS=utf8proc";
-        for lib in LLVM SUITESPARSE ARPACK BLAS FFTW LAPACK GMP MPFR LIBUNWIND OPENLIBM; do
+        for lib in LLVM SUITESPARSE ARPACK BLAS FFTW LAPACK GMP MPFR LIBUNWIND; do
             export BUILDOPTS="$BUILDOPTS USE_SYSTEM_$lib=1";
         done;
         sudo add-apt-repository ppa:staticfloat/julia-deps -y;
@@ -35,9 +38,9 @@ before_install:
           export BUILDOPTS="$BUILDOPTS MARCH=pentium4";
           sudo apt-get remove libblas3gf liblapack3gf libarmadillo2 -y;
           sudo apt-get install binutils:i386 -y;
-          sudo apt-get install gcc:i386 g++:i386 make:i386 cpp:i386 g++-4.6:i386 gcc-4.6:i386 libssl-dev:i386 patchelf:i386 gfortran:i386 llvm-3.3-dev:i386 libsuitesparse-dev:i386 libopenblas-dev:i386 libopenblas-base:i386 libblas-dev:i386 liblapack-dev:i386 liblapack3:i386 libarpack2-dev:i386 libarpack2:i386 libfftw3-dev:i386 libgmp-dev:i386 libpcre3-dev:i386 libunwind7-dev:i386 libopenlibm-dev:i386 libmpfr-dev:i386 -y;
+          sudo apt-get install gcc:i386 g++:i386 make:i386 cpp:i386 g++-4.6:i386 gcc-4.6:i386 libssl-dev:i386 patchelf:i386 gfortran:i386 llvm-3.3-dev:i386 libsuitesparse-dev:i386 libopenblas-dev:i386 libopenblas-base:i386 libblas-dev:i386 liblapack-dev:i386 liblapack3:i386 libarpack2-dev:i386 libarpack2:i386 libfftw3-dev:i386 libgmp-dev:i386 libpcre3-dev:i386 libunwind8-dev:i386 libmpfr-dev:i386 -y;
         else
-          sudo apt-get install patchelf gfortran llvm-3.3-dev libsuitesparse-dev libopenblas-dev liblapack-dev libarpack2-dev libfftw3-dev libgmp-dev libpcre3-dev libunwind7-dev libopenlibm-dev libmpfr-dev -y;
+          sudo apt-get install patchelf gfortran llvm-3.3-dev libsuitesparse-dev libopenblas-dev liblapack-dev libarpack2-dev libfftw3-dev libgmp-dev libpcre3-dev libunwind8-dev libmpfr-dev -y;
         fi;
       elif [ `uname` = "Darwin" ]; then
         brew tap staticfloat/julia;