Add include pg_getopt.h

Author: VictorSpirin

src/pg_probackup.c

@@ -17,6 +17,7 @@
 #include <time.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include "pg_getopt.h"
 
 const char *PROGRAM_VERSION	= "2.0.17";
 const char *PROGRAM_URL		= "https://github.com/postgrespro/pg_probackup";