Removes conditions from libcxx install script

Author: ryanhaining

.install-libcxx-travis.sh

@@ -1,17 +1,14 @@
 #!/usr/bin/env bash
 
-if [[  "${COMPILER}" = clang++* ]]; then
-  echo "using clang, install libc++"
-  sudo apt-get install -y dpkg
-  wget -c http://launchpadlibrarian.net/360656578/libc++-helpers_6.0-2_all.deb
-  sudo dpkg -i libc++-helpers_6.0-2_all.deb
-  wget -c http://launchpadlibrarian.net/360656583/libc++abi1_6.0-2_amd64.deb
-  sudo dpkg -i libc++abi1_6.0-2_amd64.deb
-  wget -c http://launchpadlibrarian.net/360656580/libc++1_6.0-2_amd64.deb
-  sudo dpkg -i libc++1_6.0-2_amd64.deb
-  wget -c http://launchpadlibrarian.net/360656576/libc++-dev_6.0-2_amd64.deb
-  sudo dpkg -i libc++-dev_6.0-2_amd64.deb
-  wget -c http://launchpadlibrarian.net/360656581/libc++abi-dev_6.0-2_amd64.deb
-  sudo dpkg -i libc++abi-dev_6.0-2_amd64.deb
-  sudo apt-get install -f
-fi
+sudo apt-get install -y dpkg
+wget -c http://launchpadlibrarian.net/360656578/libc++-helpers_6.0-2_all.deb
+sudo dpkg -i libc++-helpers_6.0-2_all.deb
+wget -c http://launchpadlibrarian.net/360656583/libc++abi1_6.0-2_amd64.deb
+sudo dpkg -i libc++abi1_6.0-2_amd64.deb
+wget -c http://launchpadlibrarian.net/360656580/libc++1_6.0-2_amd64.deb
+sudo dpkg -i libc++1_6.0-2_amd64.deb
+wget -c http://launchpadlibrarian.net/360656576/libc++-dev_6.0-2_amd64.deb
+sudo dpkg -i libc++-dev_6.0-2_amd64.deb
+wget -c http://launchpadlibrarian.net/360656581/libc++abi-dev_6.0-2_amd64.deb
+sudo dpkg -i libc++abi-dev_6.0-2_amd64.deb
+sudo apt-get install -f