update travis xcode version [av skip]

SIP prevents the DYLD variables from being passed to make via the environment
so pass it via the arguments instead

.travis.yml

@@ -39,7 +39,7 @@ matrix:
             - gfortran-5
     - os: osx
       env: ARCH="x86_64"
-      osx_image: xcode7
+      osx_image: xcode8
 cache:
   directories:
     - $TRAVIS_BUILD_DIR/deps/srccache
@@ -77,13 +77,13 @@ before_install:
         TESTSTORUN="all";
       elif [ `uname` = "Darwin" ]; then
         brew update;
-        brew install -v jq bar;
-        BAR="bar";
+        brew install jq pv;
+        BAR="pv -i 30";
         contrib/travis_fastfail.sh || exit 1;
         brew tap staticfloat/julia;
         brew rm --force $(brew deps --HEAD julia);
-        brew install -v cmake staticfloat/juliadeps/libgfortran;
-        brew install -v --only-dependencies --HEAD julia;
+        brew install cmake staticfloat/juliadeps/libgfortran;
+        brew install --only-dependencies --HEAD julia;
         BUILDOPTS="-j3 USECLANG=1 LLVM_CONFIG=$(brew --prefix llvm37-julia)/bin/llvm-config-3.7 LLVM_SIZE=$(brew --prefix llvm37-julia)/bin/llvm-size-3.7";
         BUILDOPTS="$BUILDOPTS VERBOSE=1 USE_BLAS64=0 SUITESPARSE_INC=-I$(brew --prefix suite-sparse-julia)/include FORCE_ASSERTIONS=1";
         BUILDOPTS="$BUILDOPTS LIBBLAS=-lopenblas LIBBLASNAME=libopenblas LIBLAPACK=-lopenblas LIBLAPACKNAME=libopenblas";
@@ -93,10 +93,12 @@ before_install:
         export CXXFLAGS=-DUSE_ORCJIT;
         export LDFLAGS="-L$(brew --prefix openblas-julia)/lib -L$(brew --prefix suite-sparse-julia)/lib";
         export DYLD_FALLBACK_LIBRARY_PATH="/usr/local/lib:/lib:/usr/lib:$(brew --prefix openblas-julia)/lib:$(brew --prefix suite-sparse-julia)/lib:$(brew --prefix arpack-julia)/lib";
+        export BUILDOPTS="$BUILDOPTS spawn='DYLD_FALLBACK_LIBRARY_PATH=\"$DYLD_FALLBACK_LIBRARY_PATH\" \$1'";
         make $BUILDOPTS -C contrib -f repackage_system_suitesparse4.make;
         TESTSTORUN="all --skip linalg/triangular subarray"; fi # TODO: re enable these if possible without timing out
     - git clone -q git://git.kitenet.net/moreutils
 script:
+    - echo $BUILDOPTS
     - make -C moreutils mispipe
     - make $BUILDOPTS -C base version_git.jl.phony
     # capture the log, but only print it if `make deps` fails