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_user_func.vim b/src/testdir/test_user_func.vim
index 4721175..4a74bc0 100644
--- a/src/testdir/test_user_func.vim
+++ b/src/testdir/test_user_func.vim
@@ -129,11 +129,9 @@
 endfunc
 
 func Test_default_arg()
-  if has('float')
-    call assert_equal(1.0, Log(10))
-    call assert_equal(log(10), Log(10, exp(1)))
-    call assert_fails("call Log(1,2,3)", 'E118:')
-  endif
+  call assert_equal(1.0, Log(10))
+  call assert_equal(log(10), Log(10, exp(1)))
+  call assert_fails("call Log(1,2,3)", 'E118:')
 
   let res = Args(1)
   call assert_equal(res.mandatory, 1)