Merge the PostgreSQL 12 ArchLinux patch from Laurent Carlier.

[GB.DB.POSTGRESQL]
* BUG: Merge the PostgreSQL 12 ArchLinux patch from Laurent Carlier.

gb.db.postgresql/src/main.c

@@ -39,15 +39,21 @@
 
 #define __MAIN_C
 
+#include <libpq-fe.h>
+#include <postgres.h>
+#include <pg_type.h>
+
+#ifdef fprintf
+	#undef fprintf
+	#undef snprintf
+	#undef sprintf
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
 
-#include <libpq-fe.h>
-#include <postgres.h>
-#include <pg_type.h>
-
 #ifdef PACKAGE_NAME
 	#undef PACKAGE_NAME
 	#undef PACKAGE_BUGREPORT