dist.sh: add .exe for windows build
dist.sh: add .exe for windows build

andyuc88/oauth2_proxy_azure,jehiah/oauth2_proxy,ploxiln/oauth2_proxy,snormore/oauth2_proxy,kalibrr/oauth2_proxy,bitly/oauth2_proxy,Shopify/google_auth_proxy,Shopify/google_auth_proxy,andyuc88/oauth2_proxy_azure,bitly/google_auth_proxy,Shopify/google_auth_proxy,ploxiln/oauth2_proxy,bitly/oauth2_proxy,bitly/google_auth_proxy,18F/oauth2_proxy,18F/oauth2_proxy,snormore/oauth2_proxy,kalibrr/oauth2_proxy,jehiah/oauth2_proxy