Install libusbx-devel for QDB on RHEL 7.4

On previous RHEL version the package was libusb1-devel. That package doesn't
seem to be there anymore, which presumably means why the package to install was
changed to libusb-devel. Unfortunately libusb-devel provides a compatibility
package for the old 0.1 API version and doesn't work with QDB. libusbx-devel
seems to be the new name for the 1.0 API version of libusb on RHEL.

(cherry picked from commit 140c6479b5)
Change-Id: I978e9842b3f0ec3a355cd1724934c99a531903ef
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>

coin/provisioning/qtci-linux-RHEL-7.4-x86_64/04-install-packages.sh

@@ -61,7 +61,7 @@ installPackages+=(gstreamer1-plugins-base-devel)
 # gtk3 style for QtGui/QStyle
 installPackages+=(gtk3-devel)
 # libusb1 for tqtc-boot2qt/qdb
-installPackages+=(libusb-devel)
+installPackages+=(libusbx-devel)
 # speech-dispatcher-devel for QtSpeech, otherwise it has no backend on Linux
 installPackages+=(speech-dispatcher-devel)
 # Python