mini-os: convert mlock macros to C functions
mini-os: convert mlock macros to C functions

mlock and munlock are implemented as macros in mini-os. Their usage
requires casting in common code.  Convert them to C syntax and provide
an empty dummy function.  Remove the now unneeded (void) cast from two
munlock calls.

Signed-off-by: Olaf Hering <ded022db89399a060a39da31922f173c6556c2d9@aepfle.de>

rowhit/xen-minios,rowhit/xen-minios,rowhit/xen-minios