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Work around rounding misbehavior exposed by buildfarm.

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Original file line number	Diff line number	Diff line change
`@@ -287,6 +287,16 @@ AddEnumLabel(Oid enumTypeOid,`
`287`	`287`	`other_nbr_en= (Form_pg_enum)GETSTRUCT(existing[other_nbr_index]);`
`288`	`288`	`newelemorder= (nbr_en->enumsortorder+`
`289`	`289`	`other_nbr_en->enumsortorder) /2;`
	`290`	`+`
	`291`	`+/*`
	`292`	`+ * On some machines, newelemorder may be in a register that's`
	`293`	`+ * wider than float4. We need to force it to be rounded to`
	`294`	`+ * float4 precision before making the following comparisons,`
	`295`	`+ * or we'll get wrong results. (Such behavior violates the C`
	`296`	`+ * standard, but fixing the compilers is out of our reach.)`
	`297`	`+ */`
	`298`	`+newelemorder=DatumGetFloat4(Float4GetDatum(newelemorder));`
	`299`	`+`
`290`	`300`	`if (newelemorder==nbr_en->enumsortorder\|\|`
`291`	`301`	`newelemorder==other_nbr_en->enumsortorder)`
`292`	`302`	`{`

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