[PATCH] conditionalize some dependencies and fix bashisms

[Joe Marcus Clarke]

Add --disable arguments for libusb and libpci (not needed on FreeBSD), and
change some instances of "==" to "=".
---
 configure.in |   75 ++++++++++++++++++++++++++++++++++-----------------------
 1 files changed, 45 insertions(+), 30 deletions(-)
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