configure.ac: detect libusb-1.0

[Tijl Coosemans]

On Wednesday 24 March 2010 18:43:22 Damjan Jovanovic wrote:
> On Wed, Mar 24, 2010 at 6:58 PM, Albert Lee <trisk at forkgnu.org> wrote:
>> There are multiple libusb implementations (notably, Solaris libusb
>> and FreeBSD libusb20) and it would be necessary to do an API test
>> for those, rather than using pkgconfig.
> 
> My patch already distinguishes between libusb-1.0 and libusb-0.1 -
> they have different headers, different libnames, and different
> pkg-config names.
> 
> Freebsd's libusb20 has all symbols starting with libusb20_tr_:
> http://www.unix.com/man-page/FreeBSD/3/libusb20/

It also implements the libusb 1.0 API:
http://www.unix.com/man-page/FreeBSD/3/libusb/