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/testdir/test_random.vim b/src/testdir/test_random.vim
index 1457310..afb3044 100644
--- a/src/testdir/test_random.vim
+++ b/src/testdir/test_random.vim
@@ -26,9 +26,7 @@
   call assert_equal(1001954530, rand())
   call test_srand_seed()
 
-  if has('float')
-    call assert_fails('echo srand(1.2)', 'E805:')
-  endif
+  call assert_fails('echo srand(1.2)', 'E805:')
   call assert_fails('echo srand([1])', 'E745:')
   call assert_fails('echo rand("burp")', 'E475:')
   call assert_fails('echo rand([1, 2, 3])', 'E730:')