🐛Fix header tracking of duplicate basename files

[nathan-moore]

Summary:

While working on another pr, I noticed we weren't generating header change tracking files for files with the same name, but different extensions. This reworks generating those based on the full un-compiled names, similar to what we do with object files.

Some people in discord were also getting confused when a file failed to compile, a could not move error from mv was showing. This also silences that.

Misc makefile cleanup from my changes.

Motivation:

Files only sometimes recompiling isn't fun, though the kernel is likely the only people to hit this.

References (optional):

None

Test Plan:

• Compile the kernel and check that the appropriate tracking files are generated.
• When a file can't be compiled, there isn't a move error.

[HotelCalifornia]

lgtm