patch 8.2.1172: error messages when doing "make clean" in doc or tee

Problem:    Error messages when doing "make clean" in the runtime/doc or
            src/tee directories.
Solution:   Use "rm -f".

runtime/doc/Makefile

@@ -396,7 +396,7 @@ test_urls:
 	vim -S test_urls.vim
 
 clean:
-	-rm doctags *.html tags.ref
+	-rm -f doctags *.html tags.ref
 
 # These files are in the extra archive, skip if not present
 

src/tee/Makefile

@@ -4,7 +4,7 @@ CC=gcc
 CFLAGS=-O2 -fno-strength-reduce
 
 ifneq (sh.exe, $(SHELL))
-DEL = rm
+DEL = rm -f
 else
 DEL = del
 endif

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1172,
 /**/
     1171,
 /**/