Revision 390138

devel/android-tools-adb-devel: add new slave port for git master

A temporary port to facilitate testing and updating master.

While copying usb_libusb.c [1] under FILESDIR clean it up:
- Add static keyword for file-local functions
- Fix const usage exposed in C++ mode [2]
- Fix casting 3rd argument of libusb_bulk_transfer(3) exposed in C++ mode
- Fix inconsistent whitespace: trailing, tabs + spaces, bogus indentation
- Fix typo in usb_kick() trace message
- Fix fprintf(3) warning in scan_usb_devices() trace message
- Convert err(3) usage to fatal_errno()
- Drop BSDism of sysexits(3)
- Drop unecessary struct keyword
- Drop unused headers [2]
- Explicitly include <signal.h> header

And chase the following commits:
https://android.googlesource.com/platform/system/core/+/506aea4%5E!/ [1]
https://android.googlesource.com/platform/system/core/+/dc3b459%5E!/#F3
https://android.googlesource.com/platform/system/core/+/9b0f354%5E!/#F5
https://android.googlesource.com/platform/system/core/+/cf07494%5E!/#F8
https://android.googlesource.com/platform/system/core/+/3313426%5E!/#F20
https://android.googlesource.com/platform/system/core/+/7664901%5E!/#F18

Changes:	https://android.googlesource.com/platform/system/core/+log/53d504f/adb
Differential Revision:	https://reviews.freebsd.org/D2870
Obtained from:	devel/android-tools-fastboot-devel (based on)
Obtained from:	OpenBSD ports [2]
Approved by:	kevlo (maintainer)