fix configure problem when building w/o USB
commitb123fd3cd9a11b2dfb79025fb137696135f5f898
authorZachary T Welch <zw@superlucidity.net>
Thu, 3 Dec 2009 06:32:08 +0000 (2 22:32 -0800)
committerZachary T Welch <zw@superlucidity.net>
Thu, 3 Dec 2009 06:32:08 +0000 (2 22:32 -0800)
tree6b72a97b5ad69ea6df06806722039dfcb041ddaf
parentf4a1070dcf6b303cb980d89c5b342cf52b0397c4
fix configure problem when building w/o USB

If building OpenOCD without any USB drivers, a warning would appear
because $build_usb is never set to a sane default.  This fixes it.
configure.in