fix: recaptcha fixes, auth fixes and line endings

* http: auth: remove unnecessary fields in recaptcha validation

* http: render: never expose ReCaptchaSecret to public

* build: dos2unix build.sh


Former-commit-id: 21908028289e4a5d30b5a2c1961abf163b1a93b6 [formerly b634e3e4da4a616119f6bc15ae92f15073f019fa] [formerly 55efca9d070539f346215090517abde1ec788be4 [formerly 9b8c2862e2]]
Former-commit-id: 70df1f0443977f6f2b101b946698dc3466aa6db9 [formerly 15195d4c28060aa1eca8f03ad0b77576ac8d9181]
Former-commit-id: e22d026e74a0cc800ad7281c35e4157037849e37

http/auth.go

@@ -39,9 +39,6 @@ func reCaptcha(secret string, response string) (bool, error) {
 
 	var data struct {
 		Success bool `json:"success"`
-		ChallengeTS time.Time   `json:"challenge_ts"`
-		Hostname    string      `json:"hostname"`
-		ErrorCodes  interface{} `json:"error-codes"`
 	}
 
 	err = json.NewDecoder(resp.Body).Decode(&data)

http/http.go

@@ -229,7 +229,6 @@ func renderFile(c *fm.Context, w http.ResponseWriter, file string) (int, error)
 		"CSS":          template.CSS(c.CSS),
 		"ReCaptcha":    c.ReCaptchaKey != "" && c.ReCaptchaSecret != "",
 		"ReCaptchaKey": c.ReCaptchaKey,
-		"ReCaptchaSecret": c.ReCaptchaSecret,
 	}
 
 	if c.StaticGen != nil {