check.h: remove obsolete header

Since we switched from autotools to Meson in commit
94592c1406, we don't need to include
`config.h` early to properly enable large file support.  Meson passes
the required macros on the compiler command line instead of defining
them in `config.h`.

This means we can include `config.h` at any time, whenever we want to
check its macros, and there are no ordering constraints.

src/db/plugins/upnp/ContentDirectoryService.cxx

@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
 #include "lib/upnp/ContentDirectoryService.hxx"
 #include "lib/upnp/ixmlwrap.hxx"
 #include "lib/upnp/UniqueIxml.hxx"

src/db/plugins/upnp/Directory.cxx

@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
 #include "Directory.hxx"
 #include "lib/upnp/Util.hxx"
 #include "lib/expat/ExpatParser.hxx"

src/db/plugins/upnp/Tags.cxx

@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
 #include "Tags.hxx"
 #include "tag/Table.hxx"
 

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
 #include "UpnpDatabasePlugin.hxx"
 #include "Directory.hxx"
 #include "Tags.hxx"