Revert "New API: Adding some usefull functions which can be used to do basics operations (mul, add, sub) in safe way (prevent overflowing)."

This reverts commit e8f6c502841f3880e512e3408f5d8debc9a79cbf.

Conflicts:
	libr/include/r_safe_int.h

revert master branch
Revert "New API: Adding some usefull functions which can be used to do basics operations (mul, add, sub) in safe way (prevent overflowing)."

This reverts commit e8f6c502841f3880e512e3408f5d8debc9a79cbf.

Conflicts:
	libr/include/r_safe_int.h

revert master branch