Add PARALLEL SAFE to spoly(float8[]) and spoly_deg(float8[]).

Author: esabol

pgs_polygon.sql.in

@@ -943,7 +943,7 @@ CREATE FUNCTION spoly(float8[])
    RETURNS spoly
    AS 'MODULE_PATHNAME', 'spherepoly_rad'
    LANGUAGE 'c'
-   IMMUTABLE STRICT;
+   IMMUTABLE STRICT PARALLEL SAFE;
 
 COMMENT ON FUNCTION spoly(float8[]) IS
    'creates spoly from array of numbers in radians';
@@ -952,7 +952,7 @@ CREATE FUNCTION spoly_deg(float8[])
    RETURNS spoly
    AS 'MODULE_PATHNAME', 'spherepoly_deg'
    LANGUAGE 'c'
-   IMMUTABLE STRICT;
+   IMMUTABLE STRICT PARALLEL SAFE;
 
 COMMENT ON FUNCTION spoly_deg(float8[]) IS
    'creates spoly from array of numbers in degrees';