Remove no-longer-needed variant expected regression result files.

numerology_1.out and float8-small-is-zero_1.out differ from their
base files only in showing plain zero rather than minus zero for
some results.  I believe that in the wake of commit 6eb3eb57,
we will print minus zero as such on all IEEE-float platforms
(and non-IEEE floats are going to cause many more regression diffs
than this, anyway).  Hence we should be able to remove these and
eliminate a bit of maintenance pain.  Let's see if the buildfarm
agrees.

Discussion: https://postgr.es/m/29037.1539021687@sss.pgh.pa.us

src/test/regress/expected/numerology_1.out

---
--- NUMEROLOGY
--- Test various combinations of numeric types and functions.
---
---
--- Test implicit type conversions
--- This fails for Postgres v6.1 (and earlier?)
---  so let's try explicit conversions for now - tgl 97/05/07
---
-CREATE TABLE TEMP_FLOAT (f1 FLOAT8);
-INSERT INTO TEMP_FLOAT (f1)
-  SELECT float8(f1) FROM INT4_TBL;
-INSERT INTO TEMP_FLOAT (f1)
-  SELECT float8(f1) FROM INT2_TBL;
-SELECT '' AS ten, f1 FROM TEMP_FLOAT
-  ORDER BY f1;
- ten |     f1      
------+-------------
-     | -2147483647
-     |     -123456
-     |      -32767
-     |       -1234
-     |           0
-     |           0
-     |        1234
-     |       32767
-     |      123456
-     |  2147483647
-(10 rows)
-
--- int4
-CREATE TABLE TEMP_INT4 (f1 INT4);
-INSERT INTO TEMP_INT4 (f1)
-  SELECT int4(f1) FROM FLOAT8_TBL
-  WHERE (f1 > -2147483647) AND (f1 < 2147483647);
-INSERT INTO TEMP_INT4 (f1)
-  SELECT int4(f1) FROM INT2_TBL;
-SELECT '' AS nine, f1 FROM TEMP_INT4
-  ORDER BY f1;
- nine |   f1   
-------+--------
-      | -32767
-      |  -1234
-      |  -1004
-      |    -35
-      |      0
-      |      0
-      |      0
-      |   1234
-      |  32767
-(9 rows)
-
--- int2
-CREATE TABLE TEMP_INT2 (f1 INT2);
-INSERT INTO TEMP_INT2 (f1)
-  SELECT int2(f1) FROM FLOAT8_TBL
-  WHERE (f1 >= -32767) AND (f1 <= 32767);
-INSERT INTO TEMP_INT2 (f1)
-  SELECT int2(f1) FROM INT4_TBL
-  WHERE (f1 >= -32767) AND (f1 <= 32767);
-SELECT '' AS five, f1 FROM TEMP_INT2
-  ORDER BY f1;
- five |  f1   
-------+-------
-      | -1004
-      |   -35
-      |     0
-      |     0
-      |     0
-(5 rows)
-
---
--- Group-by combinations
---
-CREATE TABLE TEMP_GROUP (f1 INT4, f2 INT4, f3 FLOAT8);
-INSERT INTO TEMP_GROUP
-  SELECT 1, (- i.f1), (- f.f1)
-  FROM INT4_TBL i, FLOAT8_TBL f;
-INSERT INTO TEMP_GROUP
-  SELECT 2, i.f1, f.f1
-  FROM INT4_TBL i, FLOAT8_TBL f;
-SELECT DISTINCT f1 AS two FROM TEMP_GROUP ORDER BY 1;
- two 
------
-   1
-   2
-(2 rows)
-
-SELECT f1 AS two, max(f3) AS max_float, min(f3) as min_float
-  FROM TEMP_GROUP
-  GROUP BY f1
-  ORDER BY two, max_float, min_float;
- two |      max_float       |       min_float       
------+----------------------+-----------------------
-   1 | 1.2345678901234e+200 |                     0
-   2 |                    0 | -1.2345678901234e+200
-(2 rows)
-
--- GROUP BY a result column name is not legal per SQL92, but we accept it
--- anyway (if the name is not the name of any column exposed by FROM).
-SELECT f1 AS two, max(f3) AS max_float, min(f3) AS min_float
-  FROM TEMP_GROUP
-  GROUP BY two
-  ORDER BY two, max_float, min_float;
- two |      max_float       |       min_float       
------+----------------------+-----------------------
-   1 | 1.2345678901234e+200 |                     0
-   2 |                    0 | -1.2345678901234e+200
-(2 rows)
-
-SELECT f1 AS two, (max(f3) + 1) AS max_plus_1, (min(f3) - 1) AS min_minus_1
-  FROM TEMP_GROUP
-  GROUP BY f1
-  ORDER BY two, min_minus_1;
- two |      max_plus_1      |      min_minus_1      
------+----------------------+-----------------------
-   1 | 1.2345678901234e+200 |                    -1
-   2 |                    1 | -1.2345678901234e+200
-(2 rows)
-
-SELECT f1 AS two,
-       max(f2) + min(f2) AS max_plus_min,
-       min(f3) - 1 AS min_minus_1
-  FROM TEMP_GROUP
-  GROUP BY f1
-  ORDER BY two, min_minus_1;
- two | max_plus_min |      min_minus_1      
------+--------------+-----------------------
-   1 |            0 |                    -1
-   2 |            0 | -1.2345678901234e+200
-(2 rows)
-
-DROP TABLE TEMP_INT2;
-DROP TABLE TEMP_INT4;
-DROP TABLE TEMP_FLOAT;
-DROP TABLE TEMP_GROUP;