patch 8.2.4993: smart/C/lisp indenting is optional

Problem:    smart/C/lisp indenting is optional, which makes the code more
            complex, while it only reduces the executable size a bit.
Solution:   Graduate FEAT_CINDENT, FEAT_SMARTINDENT and FEAT_LISP.
diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 72e2cf1..781f8eb 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1500,8 +1500,7 @@
 		indenting rules, as with 'cindent'.
 		The indent is counted in spaces, the value of 'tabstop' is
 		relevant.  {lnum} is used just like in |getline()|.
-		When {lnum} is invalid or Vim was not compiled the |+cindent|
-		feature, -1 is returned.
+		When {lnum} is invalid -1 is returned.
 		See |C-indenting|.
 
 		Can also be used as a |method|: >
@@ -5173,8 +5172,7 @@
 		indenting rules, as with 'lisp'.
 		The indent is counted in spaces, the value of 'tabstop' is
 		relevant.  {lnum} is used just like in |getline()|.
-		When {lnum} is invalid or Vim was not compiled the
-		|+lispindent| feature, -1 is returned.  In |Vim9| script an
+		When {lnum} is invalid -1 is returned.  In |Vim9| script an
 		error is given.
 
 		Can also be used as a |method|: >