Step.Run dep file support cannot handle output format from nasm

[Khitiara]

Zig Version

0.12.0-dev.3686+3adfaf91f

Steps to Reproduce and Observed Behavior

add a Run step in build.zig that assembles some asm program using NASM, and use the -MF option to generate a dep file. the target in the produced deb file has a trailing space before the colon which causes an error.

Expected Behavior

the dep file should be processed and used to set extra file dependencies of the run step