Dfu-programmer cannot cannot find libusb. This patch fixes that.

diff --git a/src/dfu-device.h b/src/dfu-device.h
index bbdfa99..31af0e8 100644
--- a/src/dfu-device.h
+++ b/src/dfu-device.h
@@ -6,7 +6,7 @@
 #endif
 #include <stdint.h>
 #ifdef HAVE_LIBUSB_1_0
-#include <libusb.h>
+#include <libusb-1.0/libusb.h>
 #else
 #include <usb.h>
 #endif

diff --git a/src/main.c b/src/main.c
index ef2aa16..dcc3636 100644
--- a/src/main.c
+++ b/src/main.c
@@ -24,7 +24,7 @@
 #include <stdio.h>
 #include <string.h>
 #ifdef HAVE_LIBUSB_1_0
-#include <libusb.h>
+#include <libusb-1.0/libusb.h>
 #else
 #include <usb.h>
 #endif

diff --git a/src/dfu.c b/src/dfu.c
index 7dbcc57..952e896 100644
--- a/src/dfu.c
+++ b/src/dfu.c
@@ -27,7 +27,7 @@
 #include <stdlib.h>
 #include <stddef.h>
 #ifdef HAVE_LIBUSB_1_0
-#include <libusb.h>
+#include <libusb-1.0/libusb.h>
 #else
 #include <usb.h>
 #endif

diff --git a/src/dfu.h b/src/dfu.h
index 2a159e8..63510f2 100644
--- a/src/dfu.h
+++ b/src/dfu.h
@@ -25,7 +25,7 @@
 # include <config.h>
 #endif
 #ifdef HAVE_LIBUSB_1_0
-#include <libusb.h>
+#include <libusb-1.0/libusb.h>
 #else
 #include <usb.h>
 #endif
c3'>refs</a><a class='active' href='/guix/log/gnu/services/games.scm'>log</a><a href='/guix/tree/gnu/services/games.scm?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3'>tree</a><a href='/guix/commit/gnu/services/games.scm?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3'>commit</a><a href='/guix/diff/gnu/services/games.scm?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/games.scm'>
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<div class='path'>path: <a href='/guix/log/?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3'>root</a>/<a href='/guix/log/gnu?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3'>gnu</a>/<a href='/guix/log/gnu/services?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3'>services</a>/<a href='/guix/log/gnu/services/games.scm?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3'>games.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/games.scm?id=1f9c9aed8c616ae32cea3aada4ece4b31cd420c3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-11-20 22:40:44 +0530'>2018-11-20</span></td><td><a href='/guix/commit/gnu/services/games.scm?id=662e2285f502b65600b0b5a12c040d050be8999d'>services: wesnothd: Run as wesnothd user and group.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/games.scm (wesnothd-shepherd-service): Run as wesnothd user and
group.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2018-05-14 20:15:28 +0530'>2018-05-14</span></td><td><a href='/guix/commit/gnu/services/games.scm?id=f93c7a89797667db073b1ddbb0fbbea41f16bf33'>gnu: services: Fix wesnothd-configuration? symbol export.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/games.scm: Export wesnothd-configuration?, not the
non-existent wesnoth-configuration?.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2018-02-09 14:55:17 +0530'>2018-02-09</span></td><td><a href='/guix/commit/gnu/services/games.scm?id=a76acfd3f5ea6cced10af5a191d057f29b87f277'>gnu: services: Add wesnothd service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/games.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Game Services): Document the service.
</span></span></td><td>Arun Isaac</td></tr>