Fix old thinko in pgp.h: the idea is to declare some named enum types,

not global variables of anonymous enum types.  This didn't actually hurt
much because most linkers will just merge the duplicated definitions ...
but some will complain.  Per bug #4731 from Ceriel Jacobs.

Backpatch to 8.1 --- the declarations don't exist before that.

contrib/pgcrypto/pgp.h

@@ -26,17 +26,17 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $PostgreSQL: pgsql/contrib/pgcrypto/pgp.h,v 1.4 2005/10/15 02:49:06 momjian Exp $
+ * $PostgreSQL: pgsql/contrib/pgcrypto/pgp.h,v 1.5 2009/03/25 15:03:13 tgl Exp $
  */
 
-enum
+enum PGP_S2K_TYPE
 {
 	PGP_S2K_SIMPLE = 0,
 	PGP_S2K_SALTED = 1,
 	PGP_S2K_ISALTED = 3
-} PGP_S2K_TYPE;
+};
 
-enum
+enum PGP_PKT_TYPE
 {
 	PGP_PKT_RESERVED = 0,
 	PGP_PKT_PUBENCRYPTED_SESSKEY = 1,
@@ -56,18 +56,18 @@ enum
 	PGP_PKT_SYMENCRYPTED_DATA_MDC = 18,
 	PGP_PKT_MDC = 19,
 	PGP_PKT_PRIV_61 = 61		/* occurs in gpg secring */
-} PGP_PKT_TYPE;
+};
 
-enum
+enum PGP_PUB_ALGO_TYPE
 {
 	PGP_PUB_RSA_ENCRYPT_SIGN = 1,
 	PGP_PUB_RSA_ENCRYPT = 2,
 	PGP_PUB_RSA_SIGN = 3,
 	PGP_PUB_ELG_ENCRYPT = 16,
 	PGP_PUB_DSA_SIGN = 17
-} PGP_PUB_ALGO_TYPE;
+};
 
-enum
+enum PGP_SYMENC_TYPE
 {
 	PGP_SYM_PLAIN = 0,			/* ?? */
 	PGP_SYM_IDEA = 1,			/* obsolete, PGP 2.6 compat */
@@ -80,17 +80,17 @@ enum
 	PGP_SYM_AES_192 = 8,
 	PGP_SYM_AES_256 = 9,
 	PGP_SYM_TWOFISH = 10
-} PGP_SYMENC_TYPE;
+};
 
-enum
+enum PGP_COMPR_TYPE
 {
 	PGP_COMPR_NONE = 0,			/* must */
 	PGP_COMPR_ZIP = 1,			/* should */
 	PGP_COMPR_ZLIB = 2,
 	PGP_COMPR_BZIP2 = 3
-} PGP_COMPR_TYPE;
+};
 
-enum
+enum PGP_DIGEST_TYPE
 {
 	PGP_DIGEST_MD5 = 1,			/* should, deprecated  */
 	PGP_DIGEST_SHA1 = 2,		/* must */
@@ -102,7 +102,7 @@ enum
 	PGP_DIGEST_SHA256 = 8,
 	PGP_DIGEST_SHA384 = 9,
 	PGP_DIGEST_SHA512 = 10
-} PGP_DIGEST_TYPE;
+};
 
 #define PGP_MAX_KEY    (256/8)
 #define PGP_MAX_BLOCK  (256/8)