There's a merged pull request on the void-packages repository

srb2: fix build with latest xbps-src
https://github.com/void-linux/void-packages/pull/39089

Description:
This fixes a build failure introduced by:
https://github.com/void-linux/void-packages/commit/e14cf6cc7a85fcde7fb3fdb2cdba117bede8bb19

The previously failing line of code:
https://git.do.srb2.org/STJr/SRB2/-/blob/next/src/Makefile.d/util.mk#L72-73

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#### Testing the changes
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