Fix build with curl 7.62.0

ftp/rubygem-curb/files/patch-ext-curb_errors.c

@@ -0,0 +1,28 @@
+--- ext/curb_errors.c.orig	2018-11-03 08:38:15 UTC
++++ ext/curb_errors.c
+@@ -307,9 +307,11 @@ VALUE rb_curl_easy_error(CURLcode code) 
+       exclz = eCurlErrObsolete;
+       break;
+ #endif
++#if LIBCURL_VERSION_NUM < 0x073e00
+     case CURLE_SSL_PEER_CERTIFICATE:    /* 51 - peer's certificate wasn't ok */
+       exclz = eCurlErrSSLPeerCertificate;
+       break;
++#endif
+     case CURLE_GOT_NOTHING:             /* 52 - when this is a specific error */
+       exclz = eCurlErrGotNothing;
+       break;
+@@ -334,8 +336,13 @@ VALUE rb_curl_easy_error(CURLcode code) 
+     case CURLE_SSL_CIPHER:              /* 59 - couldn't use specified cipher */
+       exclz = eCurlErrSSLCipher;
+       break;
++#if LIBCURL_VERSION_NUM >= 0x073e00
++    case CURLE_PEER_FAILED_VERIFICATION:              /* 60 - problem with the CA cert (path?) */
++      exclz = eCurlErrSSLPeerCertificate;
++#else
+     case CURLE_SSL_CACERT:              /* 60 - problem with the CA cert (path?) */
+       exclz = eCurlErrSSLCACertificate;
++#endif
+       break;
+     case CURLE_BAD_CONTENT_ENCODING:    /* 61 - Unrecognized transfer encoding */
+       exclz = eCurlErrBadContentEncoding;