patch 8.1.0545: when executing indent tests user preferences interfere

Problem:    When executing indent tests user preferences interfere.
Solution:   Add "--clean".
diff --git a/runtime/indent/Makefile b/runtime/indent/Makefile
index fa81db0..3791f33 100644
--- a/runtime/indent/Makefile
+++ b/runtime/indent/Makefile
@@ -6,8 +6,8 @@
 # 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
diff --git a/runtime/indent/testdir/runtest.vim b/runtime/indent/testdir/runtest.vim
index 5d36512..1cc0d3f 100644
--- a/runtime/indent/testdir/runtest.vim
+++ b/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
diff --git a/src/version.c b/src/version.c
index da6243b..42ce472 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    545,
+/**/
     544,
 /**/
     543,