patch 8.1.2371: FEAT_TEXT_PROP is a confusing name

Problem:    FEAT_TEXT_PROP is a confusing name.
Solution:   Use FEAT_PROP_POPUP. (Naruhiko Nishino, closes #5291)
diff --git a/src/version.c b/src/version.c
index f2c26bb..281fafc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -472,6 +472,11 @@
 #else
 	"-persistent_undo",
 #endif
+#ifdef FEAT_PROP_POPUP
+	"+popupwin",
+#else
+	"-popupwin",
+#endif
 #ifdef FEAT_PRINTER
 # ifdef FEAT_POSTSCRIPT
 	"+postscript",
@@ -614,7 +619,7 @@
 #else
 	"-textobjects",
 #endif
-#ifdef FEAT_TEXT_PROP
+#ifdef FEAT_PROP_POPUP
 	"+textprop",
 #else
 	"-textprop",
@@ -738,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2371,
+/**/
     2370,
 /**/
     2369,