patch 8.1.0545: when executing indent tests user preferences interfere

Problem:    When executing indent tests user preferences interfere.
Solution:   Add "--clean".

Author: brammool

runtime/indent/Makefile

@@ -6,8 +6,8 @@ VIM = vim
 # If a test succeeds a testdir/*.out file will be written.
 # If a test fails a testdir/*.fail file will be written.
 test:
-	$(VIM) --not-a-term -u testdir/runtest.vim
+	$(VIM) --clean --not-a-term -u testdir/runtest.vim
 
 
 clean:
-	$(VIM) --not-a-term -u testdir/cleantest.vim
+	$(VIM) --clean --not-a-term -u testdir/cleantest.vim

runtime/indent/testdir/runtest.vim

@@ -1,4 +1,6 @@
-" Runs all the indent tests for which there is no .out file
+" Runs all the indent tests for which there is no .out file.
+"
+" Current directory must be runtime/indent.
 
 set nocp
 filetype indent on

src/version.c

@@ -792,6 +792,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    545,
 /**/
     544,
 /**/