#49 libusb flags should only be kept if needed

[Mike Frysinger]

if cross-compiling urjtag, the system libusb-config script may be found, but then the detection of the function will fail. in that case, the flags from libusb-config should not be kept in the build flags.

attached patch should fix things

[Mike Frysinger]

urjtag-only-use-libusb-as-needed.patch

[Kolja Waschk]

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Thanks! Your patch(es) have been applied.