Revert "Fix #148: ARM: sadc crashes because of unaligned memory accesses"

Revert "Fix #148: ARM: sadc crashes because of unaligned memory accesses"

This reverts commit 569378eb1a3be23cdb45ac5d39e354683a7748f8.
Proposed fix for #148 "sadc crashes because of unaligned memory access"
doesn't work properly:
Copying old pointer contents to new pointer destination uses the size of
the memory pointed to by the newly allocated pointer... which is not the
size of the memory the old pointer was pointing to. The result is you
may get a segmentation fault in some cases.
So for now, revert the corresponding patch, awaiting a better solution.