scd: Fix detection of libusb.
* configure.ac (HAVE_LIBUSB): Clear if no header file was found. (LIBUSB_LIBS): Ditto.
This allows to use commit d0d9708 when libusb is installed without the
header files.
- Signed-off-by: Werner Koch <wk@gnupg.org>
scd: Fix detection of libusb. 1b90b52a56b4Unpublished Tags None Subscribers None
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