PFS: verify nrbytes
ARM: provide means to pass boot cmdline
ARM: clear BSS upon boot
Split libsys in arch dependent parts

The ARM part is not finished yet and will be fixed in a later commit.
ARM: Provide linker script for VM
VM: ARM needs more spare pages
ARM: correctly store kernel_info_struct pointer
ARM: disable __minix_init for now

On ARM we can't yet globally map pages into every process. So now that
we correctly receive the pointer to the globally mapped kern_info
struct, we have to ignore it on ARM because attempting to dereference
the pointer yields a segfault.
Also build and install log for ARM
Ramdisk: fix ramdisk creation for ARM
libcsu: store argc and argv on the stack
Kernel/ARM: use modern srsdb invocation
Kernel/ARM: faster context save
ARM: run with 64 processes only for now
VFS: fix select again

Change-Id: Ia5e26cdbfe38e3fb293dd57269a76b15c1fe236b