Revert "`Gem.load_path_insert_index always returns non-nil index after Ruby 1.9"
This reverts commit 260ef51a73c067599826c8ab110c53994c1b6226.
This broke the stable versions of Ruby like 2.4 and 2.5
Revert "`Gem.load_path_insert_index always returns non-nil index after Ruby 1.9"
This reverts commit 260ef51a73c067599826c8ab110c53994c1b6226.
This broke the stable versions of Ruby like 2.4 and 2.5