vagrant: produce borg.exe in /vagrant/borg and have it in PATH, so tests will find and test it

Vagrantfile

@@ -137,7 +137,7 @@ end
 def install_pyenv(boxname)
   return <<-EOF
     curl -s -L https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash
-    echo 'export PATH="$HOME/.pyenv/bin:$PATH"' >> ~/.bash_profile
+    echo 'export PATH="$HOME/.pyenv/bin:/vagrant/borg:$PATH"' >> ~/.bash_profile
     echo 'eval "$(pyenv init -)"' >> ~/.bash_profile
     echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.bash_profile
     echo 'export PYTHON_CONFIGURE_OPTS="--enable-shared"' >> ~/.bash_profile
@@ -232,7 +232,7 @@ def build_binary_with_pyinstaller(boxname)
     cd /vagrant/borg
     . borg-env/bin/activate
     cd borg
-    pyinstaller -F -n borg --hidden-import=logging.config borg/__main__.py
+    pyinstaller -F -n borg.exe --distpath=/vagrant/borg --clean --hidden-import=logging.config borg/__main__.py
   EOF
 end