patch 9.1.0846: debug symbols for xxd are not cleaned in Makefile

Problem:  debug symbols for xxd are not cleaned in Makefile
Solution: remove  xxd.dSYM in xxds Makefile, call xxd clean target from
          main Makefile (Yee Cheng Chin)

Remove xxd.dSYM folder when calling `make clean`. On macOS, when
compiling with debug info, clang will generate a "dSYM" folder that
contains debug symbols for the executable because unlike Linux, the
DWARF data is not embedded in the executable itself.

closes: #16010

Signed-off-by: Yee Cheng Chin <ychin.git@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 22d1d26..a1b7586 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    846,
+/**/
     845,
 /**/
     844,