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/zeroconf/AvahiPoll.cxx

@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
 #include "AvahiPoll.hxx"
 #include "event/SocketMonitor.hxx"
 #include "event/TimerEvent.hxx"

src/zeroconf/AvahiPoll.hxx

@@ -20,7 +20,6 @@
 #ifndef MPD_AVAHI_POLL_HXX
 #define MPD_AVAHI_POLL_HXX
 
-#include "check.h"
 #include "util/Compiler.h"
 
 #include <avahi-common/watch.h>

src/zeroconf/ZeroconfAvahi.cxx

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

src/zeroconf/ZeroconfBonjour.cxx

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

src/zeroconf/ZeroconfGlue.cxx

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

src/zeroconf/ZeroconfGlue.hxx

@@ -20,7 +20,7 @@
 #ifndef MPD_ZEROCONF_GLUE_HXX
 #define MPD_ZEROCONF_GLUE_HXX
 
-#include "check.h"
+#include "config.h"
 
 struct ConfigData;
 class EventLoop;