Bug 21266 – Improve TTY and color detection in build.d

tl;dr: currently build.d always uses -color=on, but this doesn't work on all CIs (e.g. not DAutoTest) The problem is that some CIs do support these coloring sequences and build.d used to be called via the Makefiles, but I presume people still wanted to have colored log output locally. Anyhow, the detection code is here: https://github.com/dlang/dmd/blob/10288e524535a51a061750e118c0144d64d93550/src/build.d#L158-L160 Probably a good idea to stop catering for the makefiles and add a similar TTY detection like DMD's (see below) and detect/hard-code the CIs which support color-coding https://github.com/dlang/dmd/blob/10288e524535a51a061750e118c0144d64d93550/src/dmd/console.d#L63 https://github.com/dlang/dmd/blob/10288e524535a51a061750e118c0144d64d93550/src/dmd/console.d#L197

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