Inline gml

[Algunenano]

Related to https://trac.osgeo.org/postgis/ticket/4674

Always use a C function directly in ST_AsGML(geometry) so the getSRSbySRID cache is used.

-- 683788 Points (1 vertex on avg)
-- EXPLAIN ANALYZE Select ST_AsGML(the_geom, 8) from benchmark_7773a711c8441d4b494a51fd9feebeac7a9b9c734619398620293;
-- Latency avg before: 8286.371 ms
-- Latency avg with cache: 223.431 ms
-- Perf: 37.08x

Follows the same style as st_asgml(geography), which was already doing this. I don't know why we have 2 implementations that are almost equal to be honest.

[Algunenano]

Merged