patch 8.1.0580: invalid memory access when using text properties

Problem:    Invalid memory access when using text properties.
Solution:   Disable text properties for now.
diff --git a/src/feature.h b/src/feature.h
index 9615a9f..404461c 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -505,7 +505,7 @@
  * +textprop		Text properties
  */
 #if defined(FEAT_EVAL) && defined(FEAT_SYN_HL)
-# define FEAT_TEXT_PROP
+// # define FEAT_TEXT_PROP
 #endif
 
 /*