patch 9.0.0491: no good reason to build without the float feature

Problem:    No good reason to build without the float feature.
Solution:   Remove configure check for float and "#ifdef FEAT_FLOAT".
diff --git a/src/version.c b/src/version.c
index 7d7ac16..15c9404 100644
--- a/src/version.c
+++ b/src/version.c
@@ -244,11 +244,7 @@
 #else
 	"-find_in_path",
 #endif
-#ifdef FEAT_FLOAT
 	"+float",
-#else
-	"-float",
-#endif
 #ifdef FEAT_FOLDING
 	"+folding",
 #else
@@ -704,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    491,
+/**/
     490,
 /**/
     489,