patch 8.1.1135: build failure for small version

Problem:    Build failure for small version. (Tony Mechelynck)
Solution:   Add #ifdef.

Author: brammool

src/buffer.c

@@ -1853,7 +1853,9 @@ curbuf_reusable(void)
 	&& curbuf->b_ffname == NULL
 	&& curbuf->b_nwindows <= 1
 	&& (curbuf->b_ml.ml_mfp == NULL || BUFEMPTY())
+#if defined(FEAT_QUICKFIX)
 	&& !bt_quickfix(curbuf)
+#endif
 	&& !curbufIsChanged());
 }
 

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1135,
 /**/
     1134,
 /**/