Fix Makefile syntax matching := and : as targets

[petabyt]

Before and after:

[Andriamanitra]

This change would cause recipes like a:b (without space) to get highlighted wrong. I would argue in your example VCAM_CORE should be highlighted as an identifier. Maybe the pattern for identifier should instead be changed to something like this?

- identifier: "^[A-Za-z0-9_./-]+"

(I'm unsure which special characters should be allowed though)

[petabyt]

That's not a bad idea, also would need to recognize wildcard %.o targets:

- identifier: "^[%A-Za-z0-9_./-]+"