sigrok-cross-mingw: Get libusb0.dll from libusb-win32.

This is one half of the fix for bug #241.
README: Update, add missing items, drop uneeded ones.
sigrok-cross-mingw: Add an option for parallel compiles.

This currently defaults to "-j 2".
sigrok-cross-mingw: Add -DENABLE_COTIRE=y for faster PulseView builds.
sigrok-cross-mingw: README: Add some more requirements.

This also fixes bug #248.
sigrok-cross-mingw: Also ship zadig.exe and zadig_xp.exe.

This is a helper tool for installing libusb-win32 or WinUSB drivers on
Windows, which is a requirement for USB devices to be recognized by
libsigrok (libusb actually) on Windows.
sigrok-cross-mingw: Bring back accidentally dropped patch.
sigrok-cross-android: Add/use $VER_GLIB.

Also, move Python block for consistency.
sigrok-fwextract-saleae-logic16: Support vendor SW ver 1.1.18
sigrok-cross-linux: Add file for simple Linux (cross-)compiles.

This script can be adjusted to build the sigrok components for various
Linux-based targets via various cross-toolchains.

Per default it will do native builds though, i.e. it can also be used
just as a simple "I don't want to type that much" script to clone,
build, and install (e.g. in $HOME/sr) all sigrok components in one go.
sysclk-lwla: Add bitstream extraction utility for the LWLA1034.