Because libntech uses our config.h.

With GPL-licensed code taken from libntech/libcompat.

This also means that we have to leave all the function-replacing
macros to libntech/configure, but that's the correct thing to do
because libcompat is part of libntech and so libntech/configure
actually determines which fuctions/code will be part of
libcompat. The only exception are the *printf() functions because
their replacements are handled by special macros (see
m4/snprintf.m4 for gore details) and we need those bits to happen
in this repo too.

So that we can make decisions based on it in our Makefile.am
files.

We have a wrapper function that checks that memory allocation was
successful. Plus our function is available in our header file and
in our utility library for the linker so we don't have to bother
(in this code) where it comes from.

It could be used to print data from the process' memory. Not
really important in cf-testd, but we should stick to good and
safe coding practices anyway.

Our version may not be 100 % compatible or at least not 100 %
optimal for the given system.