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".
diff --git a/src/tee/Makefile b/src/tee/Makefile
index 7419913..f6e9135 100644
--- a/src/tee/Makefile
+++ b/src/tee/Makefile
@@ -4,7 +4,7 @@
 CFLAGS=-O2 -fno-strength-reduce
 
 ifneq (sh.exe, $(SHELL))
-DEL = rm
+DEL = rm -f
 else
 DEL = del
 endif
diff --git a/src/version.c b/src/version.c
index c13f7f1..7f71d14 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1172,
+/**/
     1171,
 /**/
     1170,