Update /contrib regression tests for escape_string_warning.

contrib/earthdistance/earthdistance.sql.in

@@ -9,7 +9,7 @@ SET search_path = public;
 
 CREATE OR REPLACE FUNCTION earth() RETURNS float8
 LANGUAGE SQL IMMUTABLE
-AS 'SELECT \'6378168\'::float8';
+AS 'SELECT ''6378168''::float8';
 
 -- Astromers may want to change the earth function so that distances will be
 -- returned in degrees. To do this comment out the above definition and

contrib/pgcrypto/expected/pgp-encrypt.out

@@ -170,7 +170,7 @@ select pgp_sym_decrypt(
 
 -- crlf
 select encode(pgp_sym_decrypt_bytea(
-	pgp_sym_encrypt('1\n2\n3\r\n', 'key', 'convert-crlf=1'),
+	pgp_sym_encrypt(E'1\n2\n3\r\n', 'key', 'convert-crlf=1'),
  	'key'), 'hex');
         encode        
 ----------------------
@@ -179,9 +179,9 @@ select encode(pgp_sym_decrypt_bytea(
 
 -- conversion should be lossless
 select encode(digest(pgp_sym_decrypt(
-  pgp_sym_encrypt('\r\n0\n1\r\r\n\n2\r', 'key', 'convert-crlf=1'),
+  pgp_sym_encrypt(E'\r\n0\n1\r\r\n\n2\r', 'key', 'convert-crlf=1'),
  	'key', 'convert-crlf=1'), 'sha1'), 'hex') as result,
-  encode(digest('\r\n0\n1\r\r\n\n2\r', 'sha1'), 'hex') as expect;
+  encode(digest(E'\r\n0\n1\r\r\n\n2\r', 'sha1'), 'hex') as expect;
                   result                  |                  expect                  
 ------------------------------------------+------------------------------------------
  47bde5d88d6ef8770572b9cbb4278b402aa69966 | 47bde5d88d6ef8770572b9cbb4278b402aa69966

contrib/pgcrypto/sql/pgp-encrypt.sql

@@ -85,12 +85,12 @@ select pgp_sym_decrypt(
 
 -- crlf
 select encode(pgp_sym_decrypt_bytea(
-	pgp_sym_encrypt('1\n2\n3\r\n', 'key', 'convert-crlf=1'),
+	pgp_sym_encrypt(E'1\n2\n3\r\n', 'key', 'convert-crlf=1'),
  	'key'), 'hex');
 
 -- conversion should be lossless
 select encode(digest(pgp_sym_decrypt(
-  pgp_sym_encrypt('\r\n0\n1\r\r\n\n2\r', 'key', 'convert-crlf=1'),
+  pgp_sym_encrypt(E'\r\n0\n1\r\r\n\n2\r', 'key', 'convert-crlf=1'),
  	'key', 'convert-crlf=1'), 'sha1'), 'hex') as result,
-  encode(digest('\r\n0\n1\r\r\n\n2\r', 'sha1'), 'hex') as expect;
+  encode(digest(E'\r\n0\n1\r\r\n\n2\r', 'sha1'), 'hex') as expect;