RMGRDESCSOURCES is defined and used only in pg_xlogdump Makefile,
but pg_rewind Makefile mentioned it as extra files to remove in "make clean".
This patch removes that useless mention from pg_rewind Makefile.
Michael Paquier
fetch.o file_ops.o copy_fetch.o libpq_fetch.o filemap.o logging.o \
$(WIN32RES)
-EXTRA_CLEAN = $(RMGRDESCSOURCES) xlogreader.c
+EXTRA_CLEAN = xlogreader.c
all: pg_rewind