[coreboot-gerrit] [XS] Change in coreboot[main]: Makefile: Fix no-op incremental build

[Nicholas Chin (Code Review)]

Attention is currently required from: Martin L Roth.

Nicholas Chin has posted comments on this change by Nicholas Chin. ( https://review.coreboot.org/c/coreboot/+/84385?usp=email )

Change subject: Makefile: Fix no-op incremental build
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Patch Set 2:

(1 comment)

Patchset:

PS1: 
Personally I'd rather try and move away from all the quirks of GNU Make than introduce more GNUisms to fix other GNUisms, but that's probably a more involved process. This seemed like the simplest fix that minimally changes the current behaviour of the build process.