Why does Makefile chmod 777 on the build dir?

[BBaoVanC]

I didn't want to make an issue because of how many fields I have to fill out, but git blame points to 1a0909a. Is there a specific issue that's fixed by chmod-ing the build directory? CMake will automatically set the right (execute) permissions itself, and making the entire dir world readable isn't advisable for security reasons.

[vaxerski]

IIRC because back in the day some people would run sudo make release and then when they'd try to cmake --build build get an error and complain