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
89cb81'>refs</a><a class='active' href='/guix/log/gnu/services/science.scm'>log</a><a href='/guix/tree/gnu/services/science.scm?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81'>tree</a><a href='/guix/commit/gnu/services/science.scm?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81'>commit</a><a href='/guix/diff/gnu/services/science.scm?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/science.scm'>
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<div class='path'>path: <a href='/guix/log/?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81'>root</a>/<a href='/guix/log/gnu?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81'>gnu</a>/<a href='/guix/log/gnu/services?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81'>services</a>/<a href='/guix/log/gnu/services/science.scm?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81'>science.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/science.scm?id=95ad844b6afaff38dbd35fcaf907dbac0689cb81&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-09 12:55:02 +0200'>2020-12-09</span></td><td><a href='/guix/commit/gnu/services/science.scm?id=533935ccf71bef93f2f146fba1b2bb6402559965'>services: science.scm: Add missing copyright headers.</a><span class='msg-avail'>...<span class='msg-tooltip'>This module was always supposed to have the GPL3 header in place.
Follow-up to 8f19e63f760fe02f9969225da2f3f3c36801218f.

* gnu/services/science.scm: Add Copyright headers.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-06-28 14:03:03 +0300'>2020-06-28</span></td><td><a href='/guix/commit/gnu/services/science.scm?id=8f19e63f760fe02f9969225da2f3f3c36801218f'>services: Add rshiny service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/science.scm: New file.
(&lt;rshiny-configuration&gt;): New record.
(rshiny-shepherd-service-type): New variable.
* doc/guix.texi (Miscellaneous Services): Document it.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
</span></span></td><td>Efraim Flashner</td></tr>