patch 8.1.0599: without the +eval feature the indent tests don't work

Problem:    Without the +eval feature the indent tests don't work.
Solution:   Skip the body of the tests.

runtime/indent/testdir/cleantest.vim

@@ -1,6 +1,11 @@
+" Only do this with the +eval feature
+if 1
+
   " Deletes all the test output files: *.fail and *.out
   for fname in glob('testdir/*.out', 1, 1) + glob('testdir/*.fail', 1, 1)
     call delete(fname)
   endfor
 
+endif
+
 quit

runtime/indent/testdir/runtest.vim

@@ -2,6 +2,9 @@
 "
 " Current directory must be runtime/indent.
 
+" Only do this with the +eval feature
+if 1
+
 set nocp
 filetype indent on
 set nowrapscan
@@ -116,4 +119,7 @@ for fname in glob('testdir/*.in', 1, 1)
   endif
 endfor
 
+" Matching "if 1" at the start.
+endif
+
 qall!

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    599,
 /**/
     598,
 /**/