Makefile: Disable xdebug in dev tools

[staabm]

when working locally often-times xdebug is loaded which slows down some make tasks.

lets prepend XDEBUG_MODE=off to disable xdebug for commands often used and for the tools that do not already auto-disabling restarts on their own.

make cs-fix with this PR (xdebug loaded): Time: 32.12 secs; Memory: 156.5MB

make cs-fix before this PR (xdebug loaded): Time: 1 mins, 9.14 secs; Memory: 156.5MB