[raster] some permutations of st_intersection are not being dropped in older installs

[robe]

See ticket #1746 how to observe this.

Functions in question

st_intersection(raster, raster, text, regprocedure);

st_intersection(rast1 raster, rast2 raster, otheruserfunc regprocedure);

st_intersection(rast1 raster, band1 integer, rast2 raster, band2 integer, otheruserfunc regprocedure);

st_intersection(raster, integer, raster, integer, text, regprocedure);

I'm not sure we want to drop these if per chance people are using them and just instead allow them to be orphaned as they currently are.

[strk]

We want to drop anything that we ever installed and that we are not installing anymore.

[strk]

r9336 did drop st_intersection with regprocedure, evidently didn't update the drops

I'd target 2.0.0 for this..

[dustymugs]

Fixed in r9880 for 2.0. Fixed in r9879 for trunk.