patch 8.2.0183: tests fail when the float feature is disabled

Problem:    Tests fail when the float feature is disabled.
Solution:   Skip tests that don't work without float support.
diff --git a/src/testdir/test_regexp_latin.vim b/src/testdir/test_regexp_latin.vim
index a737737..501a566 100644
--- a/src/testdir/test_regexp_latin.vim
+++ b/src/testdir/test_regexp_latin.vim
@@ -2,6 +2,8 @@
 set encoding=latin1
 scriptencoding latin1
 
+source check.vim
+
 func s:equivalence_test()
   let str = "AÀÁÂÃÄÅ B C D EÈÉÊË F G H IÌÍÎÏ J K L M NÑ OÒÓÔÕÖØ P Q R S T UÙÚÛÜ V W X YÝ Z aàáâãäå b c d eèéêë f g h iìíîï j k l m nñ oòóôõöø p q r s t uùúûü v w x yýÿ z"
   let groups = split(str)
@@ -132,9 +134,9 @@
 endfunc
 
 func Test_pattern_compile_speed()
-  if !exists('+spellcapcheck') || !has('reltime')
-    return
-  endif
+  CheckOption spellcapcheck
+  CheckFunction reltimefloat
+
   let start = reltime()
   " this used to be very slow, not it should be about a second
   set spc=\\v(((((Nxxxxxxx&&xxxx){179})+)+)+){179}