RFR: 8333477: Delete extra empty spaces in Makefiles

[Chen Liang]

On Tue, 4 Jun 2024 07:47:46 GMT, SendaoYan <syan at openjdk.org> wrote:

> Hi all,
>   This PR several extra empty spaces and extra empty lines in several Makefiles. It's trivial fix, no risk.
> 
> Thanks.

@altrisi As trivial and low-effort as this seems, this is actually fixing some technical debt for legacy Makefiles last changed before 8e7a855ee8f085cee080395058f79c8a75bfef40 when trailing whitespace checks applied to Makefiles.

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PR Comment: https://git.openjdk.org/jdk/pull/19537#issuecomment-2148641237