mktime_tz is blocking, don't use it

Change-Id: I0a66a69b68d975389302ae4361c9c106eb722538
MTP: fix some code paths

Still doesn't fix the bug of copying zip files to the root of
storage in Windows.

Change-Id: Iddec66a49c17cf48cbd1c67ad6679349ece8e05c
MTP: Build flag for setting custom MTP device/path

Change-Id: Ic19ec61dc6cb08df00eb1326d96262b46bb93bfb
Fix handling of MTP fork/child process

Change-Id: Iacd8a38d21e9c8b0dfafefbeb646f46cd3ba02a1