btrfs-progs: libbtrfs: move libbtrfs.sym to the directory

The symbol definition is part of the library, move it away from the
toplevel directory.

Signed-off-by: David Sterba <dsterba@suse.com>

Makefile

@@ -546,16 +546,16 @@ kernel-lib/tables.c:
 	@echo "    [TABLE]  $@"
 	$(Q)./mktables > $@ || ($(RM) -f $@ && exit 1)
 
-libbtrfs.so.0.1: $(libbtrfs_objects) libbtrfs.sym
+libbtrfs.so.0.1: $(libbtrfs_objects) libbtrfs/libbtrfs.sym
 	@echo "    [LD]     $@"
 	$(Q)$(CC) $(CFLAGS) $(filter %.o,$^) $(LDFLAGS) $(LIBBTRFS_LIBS) \
-		-shared -Wl,-soname,libbtrfs.so.0 -Wl,--version-script=libbtrfs.sym -o $@
+		-shared -Wl,-soname,libbtrfs.so.0 -Wl,--version-script=libbtrfs/libbtrfs.sym -o $@
 
 libbtrfs.a: $(libbtrfs_objects)
 	@echo "    [AR]     $@"
 	$(Q)$(AR) cr $@ $^
 
-libbtrfs.so.0 libbtrfs.so: libbtrfs.so.0.1 libbtrfs.sym
+libbtrfs.so.0 libbtrfs.so: libbtrfs.so.0.1 libbtrfs/libbtrfs.sym
 	@echo "    [LN]     $@"
 	$(Q)$(LN_S) -f $< $@