title: spTransform() in R warnings with PROJ
body: <p>I'm in R v 4.0.4 - sp v 1.4-5, and rgdal 1.5-23.  I'm loading a shapefile using the rgdal package and then trying to simply apply spTransform() but I'm getting a ridiculous set of warnings that I can't get rid of. Anyone have any insight on this?</p>
  <pre><code>options(&quot;rgdal_show_exportToProj4_warnings&quot;=&quot;none&quot;)
  library(rgdal)
  library(sp)
  
  ## Shapefile has a projection of WGS84
  X &lt;- readOGR(dsn=&quot;.&quot;, layer=&quot;myshapefile.shp&quot;)
  UTM30 &lt;- sf::st_crs(32630)$proj4string
  
  transf &lt;- spTransform(X,UTM30)
  
  ############################################################
  ### This warning gets repeated tens to hundreds of times ###
  
  proj_as_proj_string: C:\PostgreSQL\13\share\contrib\postgis-3.1\proj\proj.db lacks DATABASE.LAYOUT.VERSION.MAJOR / DATABASE.LAYOUT.VERSION.MINOR metadata. It comes from another PROJ installation.
  proj_as_wkt: C:\PostgreSQL\13\share\contrib\postgis-3.1\proj\proj.db lacks DATABASE.LAYOUT.VERSION.MAJOR / DATABASE.LAYOUT.VERSION.MINOR metadata. It comes from another PROJ installation.
  proj_create: C:\PostgreSQL\13\share\contrib\postgis-3.1\proj\proj.db lacks DATABASE.LAYOUT.VERSION.MAJOR / DATABASE.LAYOUT.VERSION.MINOR metadata. It comes from another PROJ installation.
  </code></pre>
  <p>Anyone come across this yet and managed to squash it?</p>
  <p>Cheers</p>