libkmod: Allow better optimization

libkmod: Allow better optimization

If we have native endianess, i.e. parsing modules for the running
system, assist the compiler to note that it is really much faster to
move a word/qword etc. instead of actually running through a loop.

Reduces library instructions on x86_64 by 1.4 % and binary instructions
by 3 % with default configuration.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/187
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>