package/openocd: select libusb when selecting libusb-compat

libusb-compat depends on libusb package, so we need to select
libusb package at the same time as libusb-compat to avoid an
unmet dependency.

Since 28f67899e54f15c6e48484ea2976c3e431756bcb, the build
stop if a package build is trigged at Makefile level without
being selected at Config.in level.

This is the case here with BR2_PACKAGE_OPENOCD_USBPROG which
select BR2_PACKAGE_LIBUSB_COMPAT without selecting
BR2_PACKAGE_LIBUSB.

Fixes:
http://autobuild.buildroot.net/results/b4a/b4a8c54eed6bf75ab8ade0653953d19792155727/

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/openocd/Config.in

@@ -84,6 +84,7 @@ config BR2_PACKAGE_OPENOCD_AICE
 
 config BR2_PACKAGE_OPENOCD_VSLLINK
 	bool "Versaloon-Link JTAG Programmer"
+	select BR2_PACKAGE_LIBUSB
 	select BR2_PACKAGE_LIBUSB_COMPAT
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libusb-compat -> libusb
 	help
@@ -92,6 +93,7 @@ config BR2_PACKAGE_OPENOCD_VSLLINK
 
 config BR2_PACKAGE_OPENOCD_USBPROG
 	bool "USBProg JTAG Programmer"
+	select BR2_PACKAGE_LIBUSB
 	select BR2_PACKAGE_LIBUSB_COMPAT
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libusb-compat -> libusb
 	help
@@ -100,6 +102,7 @@ config BR2_PACKAGE_OPENOCD_USBPROG
 
 config BR2_PACKAGE_OPENOCD_RLINK
 	bool "Raisonance RLink JTAG Programmer"
+	select BR2_PACKAGE_LIBUSB
 	select BR2_PACKAGE_LIBUSB_COMPAT
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libusb-compat -> libusb
 	help
@@ -108,6 +111,7 @@ config BR2_PACKAGE_OPENOCD_RLINK
 
 config BR2_PACKAGE_OPENOCD_ARMEW
 	bool "Olimex ARM-JTAG-EW Programmer"
+	select BR2_PACKAGE_LIBUSB
 	select BR2_PACKAGE_LIBUSB_COMPAT
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libusb-compat -> libusb
 	help
@@ -186,6 +190,7 @@ config BR2_PACKAGE_OPENOCD_PRESTO
 config BR2_PACKAGE_OPENOCD_OPENJTAG
 	bool "OpenJTAG Programmer"
 	select BR2_PACKAGE_LIBFTDI1
+	select BR2_PACKAGE_LIBUSB
 	select BR2_PACKAGE_LIBUSB_COMPAT # needs usb.h
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libftdi -> libusb
 	depends on BR2_ARCH_HAS_ATOMICS