Revert the timestamp checks back to (>=) from (>).

cabal-install/Distribution/Client/IndexUtils.hs

@@ -240,8 +240,7 @@ whenCacheOutOfDate origFile cacheFile action = do
     else do
       origTime  <- getModificationTime origFile
       cacheTime <- getModificationTime cacheFile
-      -- FIXME: Revert back to >= when we'll add finer-resolution mtime utils.
-      unless (cacheTime > origTime) action
+      unless (cacheTime >= origTime) action
 
 
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cabal-install/Distribution/Client/Sandbox/Timestamp.hs

@@ -269,8 +269,7 @@ isDepModified verbosity now (packageDir, timestamp) = do
       when (modTime > now) $
         warn verbosity $ "File '" ++ dep
                          ++ "' has a modification time that is in the future."
-      -- FIXME: Revert back to >= when we'll add finer-resolution mtime utils.
-      if modTime > timestamp
+      if modTime >= timestamp
         then do
           debug verbosity ("Dependency has a modified source file: " ++ dep)
           return True