fix typo in pypy-5.9 package name for non-ubuntu linux distros

https://github.com/pyenv/pyenv/pull/1005#discussion_r143206847

plugins/python-build/share/python-build/pypy2.7-5.9.0

@@ -20,7 +20,7 @@ case "$(pypy_architecture 2>/dev/null || true)" in
   if require_distro "Ubuntu 14.04" 1>/dev/null 2>&1; then
     install_package "pypy2-v5.9.0-linux64" "https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.9.0-linux64.tar.bz2#790febd4f09e22d6e2f81154efc7dc4b2feec72712aaf4f82aa91b550abb4b48" "pypy" verify_py27 ensurepip
   else
-    install_package "pypy-5.8-linux_x86_64-portable" "https://bitbucket.org/squeaky/portable-pypy/downloads/pypy-5.9-linux_x86_64-portable.tar.bz2#8d39eb98df3adf7882a7f3551f47b8c7cff47a0e20d6aabc57bb592f155c2616" "pypy" verify_py27 ensurepip
+    install_package "pypy-5.9-linux_x86_64-portable" "https://bitbucket.org/squeaky/portable-pypy/downloads/pypy-5.9-linux_x86_64-portable.tar.bz2#8d39eb98df3adf7882a7f3551f47b8c7cff47a0e20d6aabc57bb592f155c2616" "pypy" verify_py27 ensurepip
   fi
   ;;
 "osx64" )

plugins/python-build/share/python-build/pypy3.5-5.9.0

@@ -3,7 +3,7 @@ case "$(pypy_architecture 2>/dev/null || true)" in
   if require_distro "Ubuntu 14.04" 1>/dev/null 2>&1; then
     install_package "pypy3-v5.9.0-linux64" "https://bitbucket.org/pypy/pypy/downloads/pypy3-v5.9.0-linux64.tar.bz2#d8c41ede3758127718944cc2fd6bf78ed4303d946f85596cac91281ccce36165" "pypy" verify_py35 ensurepip
   else
-    install_package "pypy3.5-5.8-beta-linux_x86_64-portable" "https://bitbucket.org/squeaky/portable-pypy/downloads/pypy3.5-5.9-beta-linux_x86_64-portable.tar.bz2#b0a79dabe2c48b0374d567936139ecf1379904a504d4a645be5c3e7e35140575" "pypy" verify_py35 ensurepip
+    install_package "pypy3.5-5.9-beta-linux_x86_64-portable" "https://bitbucket.org/squeaky/portable-pypy/downloads/pypy3.5-5.9-beta-linux_x86_64-portable.tar.bz2#b0a79dabe2c48b0374d567936139ecf1379904a504d4a645be5c3e7e35140575" "pypy" verify_py35 ensurepip
   fi
   ;;
 * )