Split contrib/cube platform-depended checks into separate test

We're currently maintaining two outputs for cube regression test.  But that
appears to be unsuitable, because these outputs are different in out few checks
involving scientific notation.  So, split checks involving scientific notation
into separate test, making contrib/cube easier to maintain.  Backpatch to all
supported versions in order to make further backpatching easier.

Discussion: https://postgr.es/m/CAPpHfdvJgWjxHsJTtT%2Bo1tz3OR8EFHcLQjhp-d3%2BUcmJLh-fQA%40mail.gmail.com
Author: Alexander Korotkov
Backpatch-through: 9.3

Author: akorotkov

contrib/cube/Makefile

@@ -8,7 +8,7 @@ DATA = cube--1.2.sql cube--1.1--1.2.sql cube--1.0--1.1.sql \
 	cube--unpackaged--1.0.sql
 PGFILEDESC = "cube - multidimensional cube data type"
 
-REGRESS = cube
+REGRESS = cube cube_sci
 
 EXTRA_CLEAN = y.tab.c y.tab.h
 

contrib/cube/expected/cube.out

@@ -54,108 +54,6 @@ SELECT '-1.0'::cube AS cube;
  (-1)
 (1 row)
 
-SELECT '1e27'::cube AS cube;
-  cube   
----------
- (1e+27)
-(1 row)
-
-SELECT '-1e27'::cube AS cube;
-   cube   
-----------
- (-1e+27)
-(1 row)
-
-SELECT '1.0e27'::cube AS cube;
-  cube   
----------
- (1e+27)
-(1 row)
-
-SELECT '-1.0e27'::cube AS cube;
-   cube   
-----------
- (-1e+27)
-(1 row)
-
-SELECT '1e+27'::cube AS cube;
-  cube   
----------
- (1e+27)
-(1 row)
-
-SELECT '-1e+27'::cube AS cube;
-   cube   
-----------
- (-1e+27)
-(1 row)
-
-SELECT '1.0e+27'::cube AS cube;
-  cube   
----------
- (1e+27)
-(1 row)
-
-SELECT '-1.0e+27'::cube AS cube;
-   cube   
-----------
- (-1e+27)
-(1 row)
-
-SELECT '1e-7'::cube AS cube;
-  cube   
----------
- (1e-07)
-(1 row)
-
-SELECT '-1e-7'::cube AS cube;
-   cube   
-----------
- (-1e-07)
-(1 row)
-
-SELECT '1.0e-7'::cube AS cube;
-  cube   
----------
- (1e-07)
-(1 row)
-
-SELECT '-1.0e-7'::cube AS cube;
-   cube   
-----------
- (-1e-07)
-(1 row)
-
-SELECT '1e-700'::cube AS cube;
- cube 
-------
- (0)
-(1 row)
-
-SELECT '-1e-700'::cube AS cube;
- cube 
-------
- (0)
-(1 row)
-
-SELECT '1234567890123456'::cube AS cube;
-          cube          
-------------------------
- (1.23456789012346e+15)
-(1 row)
-
-SELECT '+1234567890123456'::cube AS cube;
-          cube          
-------------------------
- (1.23456789012346e+15)
-(1 row)
-
-SELECT '-1234567890123456'::cube AS cube;
-          cube           
--------------------------
- (-1.23456789012346e+15)
-(1 row)
-
 SELECT '.1234567890123456'::cube AS cube;
         cube         
 ---------------------