use AC_CHECK_TOOL for libusb-config

AC_PATH_PROG is for build tools while AC_PATH_TOOL is for the host tools.
Since we want a libusb that is for the host machine and not the build
machine, use the TOOL variant.

I don't personally see the point in using the full path either since the
short name will be found in a PATH lookup, so further change the macro
from the PATH variant to the CHECK variant.

Also drop the incorrect third argument of $PATH.  The third argument is
a fall back value, not the path to search.  Ignoring that, $PATH is the
default value anyways, so no need to specify it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/configure.in b/configure.in
index f00d70c..addf696 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -8,7 +8,7 @@ AM_PROG_LIBTOOL
 AC_PROG_CXX
 
 dnl check for libusb-config
-AC_PATH_PROG(HAVELIBUSB, libusb-config, $PATH)
+AC_CHECK_TOOL(HAVELIBUSB, libusb-config)
 
 if test ! -z "$HAVELIBUSB"; then
    LIBUSB_CFLAGS=`$HAVELIBUSB --cflags`