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Restore handling of -0 in the C field of lines in line_construct().

Commita7dc63d inadvertedly removed this bit originally introducedby43fe90f, causing regression test failures on some platforms,due to producing {1,-1,-0} instead of {1,-1,0}.

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src/backend/utils/adt
- geo_ops.c

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`‎src/backend/utils/adt/geo_ops.c`

Lines changed: 3 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1024,6 +1024,9 @@ line_construct(LINE result, Point pt, float8 m)`
`1024`	`1024`	`result->A=m;`
`1025`	`1025`	`result->B=-1.0;`
`1026`	`1026`	`result->C=pt->y-m*pt->x;`
	`1027`	`+/* on some platforms, the preceding expression tends to produce -0 */`
	`1028`	`+if (result->C==0.0)`
	`1029`	`+result->C=0.0;`
`1027`	`1030`	`}`
`1028`	`1031`	`}`
`1029`	`1032`

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Commit74294c7

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`‎src/backend/utils/adt/geo_ops.c`

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