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/src/textformat.c b/src/textformat.c
index e15081a..a6a3b4d 100644
--- a/src/textformat.c
+++ b/src/textformat.c
@@ -108,7 +108,6 @@
 	    char_u *line = ml_get_curline();
 
 	    leader_len = get_leader_len(line, NULL, FALSE, TRUE);
-#ifdef FEAT_CINDENT
 	    if (leader_len == 0 && curbuf->b_p_cin)
 	    {
 		int		comment_start;
@@ -123,7 +122,6 @@
 			leader_len += comment_start;
 		}
 	    }
-#endif
 	}
 	else
 	    leader_len = 0;
@@ -444,16 +442,12 @@
 	}
 
 	haveto_redraw = TRUE;
-#ifdef FEAT_CINDENT
 	set_can_cindent(TRUE);
-#endif
 	// moved the cursor, don't autoindent or cindent now
 	did_ai = FALSE;
-#ifdef FEAT_SMARTINDENT
 	did_si = FALSE;
 	can_si = FALSE;
 	can_si_back = FALSE;
-#endif
 	line_breakcheck();
     }
 
@@ -1119,14 +1113,10 @@
 		    // indent.
 		    if (curwin->w_cursor.lnum == first_line)
 			indent = get_indent();
-		    else
-# ifdef FEAT_LISP
-		    if (curbuf->b_p_lisp)
+		    else if (curbuf->b_p_lisp)
 			indent = get_lisp_indent();
 		    else
-# endif
 		    {
-#ifdef FEAT_CINDENT
 			if (cindent_on())
 			{
 			    indent =
@@ -1136,7 +1126,6 @@
 				 get_c_indent();
 			}
 			else
-#endif
 			    indent = get_indent();
 		    }
 		    (void)set_indent(indent, SIN_CHANGED);