Revert "Tweak "line" test to avoid negative zeros on some platforms"

This reverts commit a0a546f0.
It seems better to tweak the code to suppress -0 results during
line_construct_pts(), which I'll do in the next commit.

src/test/regress/expected/line.out

@@ -5,7 +5,7 @@
 --DROP TABLE LINE_TBL;
 CREATE TABLE LINE_TBL (s line);
 INSERT INTO LINE_TBL VALUES ('{1,-1,1}');
-INSERT INTO LINE_TBL VALUES ('(0,0.1),(6,6)');
+INSERT INTO LINE_TBL VALUES ('(0,0),(6,6)');
 INSERT INTO LINE_TBL VALUES ('10,-10 ,-5,-4');
 INSERT INTO LINE_TBL VALUES ('[-1e6,2e2,3e5, -4e1]');
 INSERT INTO LINE_TBL VALUES ('(11,22,33,44)');
@@ -42,7 +42,7 @@ select * from LINE_TBL;
                       s                      
 ---------------------------------------------
  {1,-1,1}
- {0.983333333333333,-1,0.1}
+ {1,-1,0}
  {-0.4,-1,-6}
  {-0.000184615384615385,-1,15.3846153846154}
  {1,-1,11}
@@ -55,7 +55,7 @@ SELECT * FROM LINE_TBL WHERE (s <-> line '[(1,2),(3,4)]') < 10;
                       s                      
 ---------------------------------------------
  {1,-1,1}
- {0.983333333333333,-1,0.1}
+ {1,-1,0}
  {-0.4,-1,-6}
  {-0.000184615384615385,-1,15.3846153846154}
  {1,-1,11}
@@ -64,17 +64,17 @@ SELECT * FROM LINE_TBL WHERE (s <-> line '[(1,2),(3,4)]') < 10;
 (7 rows)
 
 SELECT * FROM LINE_TBL WHERE (point '(0.1,0.1)' <-> s) < 1;
-             s              
-----------------------------
+    s     
+----------
  {1,-1,1}
- {0.983333333333333,-1,0.1}
+ {1,-1,0}
 (2 rows)
 
 SELECT * FROM LINE_TBL WHERE (lseg '[(0.1,0.1),(0.2,0.2)]' <-> s) < 1;
-             s              
-----------------------------
+    s     
+----------
  {1,-1,1}
- {0.983333333333333,-1,0.1}
+ {1,-1,0}
 (2 rows)
 
 SELECT line '[(1,1),(2,1)]' <-> line '[(-1,-1),(-2,-1)]';

src/test/regress/sql/line.sql

@@ -7,7 +7,7 @@
 CREATE TABLE LINE_TBL (s line);
 
 INSERT INTO LINE_TBL VALUES ('{1,-1,1}');
-INSERT INTO LINE_TBL VALUES ('(0,0.1),(6,6)');
+INSERT INTO LINE_TBL VALUES ('(0,0),(6,6)');
 INSERT INTO LINE_TBL VALUES ('10,-10 ,-5,-4');
 INSERT INTO LINE_TBL VALUES ('[-1e6,2e2,3e5, -4e1]');
 INSERT INTO LINE_TBL VALUES ('(11,22,33,44)');