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/float.c b/src/float.c
index aa7d697..04bb8a1 100644
--- a/src/float.c
+++ b/src/float.c
@@ -14,7 +14,7 @@
 
 #include "vim.h"
 
-#if (defined(FEAT_EVAL) && defined(FEAT_FLOAT)) || defined(PROTO)
+#if defined(FEAT_EVAL) || defined(PROTO)
 
 #ifdef VMS
 # include <float.h>