travis.sh: install libbullet-dev for jskeus tests

.travis.sh

@@ -28,7 +28,7 @@ if [ "$TRAVIS_OS_NAME" == "linux" ]; then
     travis_time_end
 
     travis_time_start setup.apt-get_install
-    ret=1; while [ $ret != 0 ]; do sudo apt-get install -qq -y git make gcc g++ libjpeg-dev libxext-dev libx11-dev libgl1-mesa-dev libglu1-mesa-dev libpq-dev libpng-dev xfonts-100dpi xfonts-75dpi && ret=0 || echo "failed, retry"; done # msttcorefonts could not install on 14.04 travis
+    ret=1; while [ $ret != 0 ]; do sudo apt-get install -qq -y git make gcc g++ libjpeg-dev libxext-dev libx11-dev libgl1-mesa-dev libglu1-mesa-dev libpq-dev libpng-dev xfonts-100dpi xfonts-75dpi libbullet-dev && ret=0 || echo "failed, retry"; done # msttcorefonts could not install on 14.04 travis
     if [ "`uname -m`" == "x86_64" ] ; then sudo apt-get install -qq -y texlive-latex-base ptex-bin latex2html nkf poppler-utils || echo "ok"; fi # 16.04 does ont have ptex bin
     travis_time_end
 
@@ -41,6 +41,7 @@ if [ "$TRAVIS_OS_NAME" == "osx" ]; then
     brew list jpeg &>/dev/null || brew install jpeg
     brew list libpng &>/dev/null || brew install libpng
     brew list mesalib-glw &>/dev/null || brew install mesalib-glw
+    brew list libbullet-dev &>/dev/null || brew install libbullet-dev
     travis_time_end
 
 fi