Remove HTTP_AUTH_xxx constants that (apparently) have never been used.

cups/http.h

@@ -94,17 +94,6 @@ extern "C" {
 // Types and structures...
 //
 
-typedef enum http_auth_e // HTTP authentication types @exclude all@
-{
- HTTP_AUTH_NONE, // No authentication in use
- HTTP_AUTH_BASIC, // Basic authentication in use
- HTTP_AUTH_MD5, // Digest authentication in use
- HTTP_AUTH_MD5_SESS, // MD5-session authentication in use
- HTTP_AUTH_MD5_INT, // Digest authentication in use for body
- HTTP_AUTH_MD5_SESS_INT, // MD5-session authentication in use for body
- HTTP_AUTH_NEGOTIATE // GSSAPI authentication in use @since CUPS 1.3/macOS 10.5@
-} http_auth_t;
-
 typedef enum http_encoding_e // HTTP transfer encoding values
 {
  HTTP_ENCODING_LENGTH, // Data is sent with Content-Length
@@ -150,9 +139,9 @@ typedef enum http_field_e // HTTP field names
  HTTP_FIELD_UPGRADE, // Upgrade field
  HTTP_FIELD_USER_AGENT, // User-Agent field
  HTTP_FIELD_WWW_AUTHENTICATE, // WWW-Authenticate field
- HTTP_FIELD_ACCEPT_ENCODING, // Accepting-Encoding field @since CUPS 1.7/macOS 10.9@
- HTTP_FIELD_ALLOW, // Allow field @since CUPS 1.7/macOS 10.9@
- HTTP_FIELD_SERVER, // Server field @since CUPS 1.7/macOS 10.9@
+ HTTP_FIELD_ACCEPT_ENCODING, // Accepting-Encoding field @since CUPS 1.7@
+ HTTP_FIELD_ALLOW, // Allow field @since CUPS 1.7@
+ HTTP_FIELD_SERVER, // Server field @since CUPS 1.7@
  HTTP_FIELD_AUTHENTICATION_INFO, // Authentication-Info field @since CUPS 2.2.9@
  HTTP_FIELD_ACCESS_CONTROL_ALLOW_CREDENTIALS,
  // CORS/Fetch Access-Control-Allow-Credentials field @since CUPS 2.4@
@@ -207,14 +196,14 @@ typedef enum http_state_e // HTTP state values; states are server-oriented...
  HTTP_STATE_TRACE, // TRACE command, waiting for blank line
  HTTP_STATE_CONNECT, // CONNECT command, waiting for blank line
  HTTP_STATE_STATUS, // Command complete, sending status
- HTTP_STATE_UNKNOWN_METHOD, // Unknown request method, waiting for blank line @since CUPS 1.7/macOS 10.9@
- HTTP_STATE_UNKNOWN_VERSION // Unknown request method, waiting for blank line @since CUPS 1.7/macOS 10.9@
+ HTTP_STATE_UNKNOWN_METHOD, // Unknown request method, waiting for blank line @since CUPS 1.7@
+ HTTP_STATE_UNKNOWN_VERSION // Unknown request method, waiting for blank line @since CUPS 1.7@
 } http_state_t;
 
 typedef enum http_status_e // HTTP status codes
 {
  HTTP_STATUS_ERROR = -1, // An error response from httpXxxx()
- HTTP_STATUS_NONE = 0, // No Expect value @since CUPS 1.7/macOS 10.9@
+ HTTP_STATUS_NONE = 0, // No Expect value @since CUPS 1.7@
 
  HTTP_STATUS_CONTINUE = 100, // Everything OK, keep going...
  HTTP_STATUS_SWITCHING_PROTOCOLS, // HTTP upgrade to TLS/SSL
@@ -284,7 +273,7 @@ typedef enum http_status_e // HTTP status codes
 
  HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED = 1000,
  // User canceled authorization @since CUPS 1.4@
- HTTP_STATUS_CUPS_PKI_ERROR, // Error negotiating a secure connection @since CUPS 1.5/macOS 10.7@
+ HTTP_STATUS_CUPS_PKI_ERROR, // Error negotiating a secure connection @since CUPS 1.5@
  HTTP_STATUS_CUPS_WEBIF_DISABLED // Web interface is disabled @private@
 
 // Renamed status codes from latest RFCs...
@@ -339,7 +328,7 @@ typedef enum http_version_e // HTTP version numbers @exclude all@
  HTTP_VERSION_1_1 = 101 // HTTP/1.1
 } http_version_t;
 
-typedef union _http_addr_u // Socket address union, which makes using IPv6 and other address types easier and more portable. @since CUPS 1.2/macOS 10.5@
+typedef union _http_addr_u // Socket address union, which makes using IPv6 and other address types easier and more portable. @since CUPS 1.2@
 {
  struct sockaddr addr; // Base structure for family value
  struct sockaddr_in ipv4; // IPv4 address
@@ -352,7 +341,7 @@ typedef union _http_addr_u // Socket address union, which makes using IPv6 and
  char pad[256]; // Padding to ensure binary compatibility @private@
 } http_addr_t;
 
-typedef struct http_addrlist_s // Socket address list, which is used to enumerate all of the addresses that are associated with a hostname. @since CUPS 1.2/macOS 10.5@ @exclude all@
+typedef struct http_addrlist_s // Socket address list, which is used to enumerate all of the addresses that are associated with a hostname. @since CUPS 1.2@ @exclude all@
 {
  struct http_addrlist_s *next; // Pointer to next address in list
  http_addr_t addr; // Address
@@ -370,7 +359,7 @@ typedef bool (*http_resolve_cb_t)(void *data);
  // @link httpResolveURI@ callback @since CUPS 2.5@
 
 typedef int (*http_timeout_cb_t)(http_t *http, void *user_data);
- // HTTP timeout callback @since CUPS 1.5/macOS 10.7@
+ // HTTP timeout callback @since CUPS 1.5@
 
 
 //