Use precise for legacy build

src/travis/linux-x86_64-before-install.sh

@@ -77,7 +77,7 @@ else
 
   $python -V
 
-  if [[ "$dist" == "xenial" ]]; then
+  if [[ "$dist" == "precise" ]]; then
     echo "Installing deps for StaticX..."
     sudo apt-get install --yes patchelf scons musl
     $pip install git+https://github.com/JonathonReinhart/staticx.git@master

src/travis/linux-x86_64-install.sh

@@ -18,7 +18,7 @@ else
   du -h gam/gam
   time $gam version extended
 
-  if [[ "$dist" == "xenial" ]]; then
+  if [[ "$dist" == "precise" ]]; then
     GAM_LEGACY_ARCHIVE=gam-$GAMVERSION-$GAMOS-$PLATFORM-legacy.tar.xz
     $python -OO -m staticx gam/gam gam/gam-staticx
     strip gam/gam-staticx