Remove unused NextLogPage macro

Commit 061e7efb1b did away with its last caller, but neglected to remove
the actual definition.

Author: Andres Freund

src/include/access/xlog_internal.h

@@ -119,17 +119,6 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;
 #define XLogSegNoOffsetToRecPtr(segno, offset, dest) \
 		(dest) = (segno) * XLOG_SEG_SIZE + (offset)
 
-/*
- * Macros for manipulating XLOG pointers
- */
-
-/* Align a record pointer to next page */
-#define NextLogPage(recptr) \
-	do {	\
-		if ((recptr) % XLOG_BLCKSZ != 0)	\
-			XLByteAdvance(recptr, (XLOG_BLCKSZ - (recptr) % XLOG_BLCKSZ)); \
-	} while (0)
-
 /*
  * Compute ID and segment from an XLogRecPtr.
  *