scripts: remove CVS header from getent

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
inet: remove noreturn attribute from res_nclose

Partially revert e9af4dfbd328e9f3bba235fdb2d1027dd2dbbcde

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
nice: fix overflow checking in int_add_no_wrap()

In C, signed integer overflow is undefined behavior.  Many compilers
optimize away checks like `a + b < a'.

Use safe precondition testing instead.

Signed-off-by: Xi Wang <xi@mit.edu>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>