configure.ac: Bump libtool library version

Programs using the previous version may use the new version as drop-in
replacement, but programs using the new version may use APIs not present
in the previous one.

Signed-off-by: Tormod Volden <debian.tormod@gmail.com>

configure.ac

@@ -31,9 +31,9 @@ dnl Library versioning
 dnl These numbers should be tweaked on every release. Read carefully:
 dnl http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
 dnl http://sourceware.org/autobook/autobook/autobook_91.html
-lt_current=3
+lt_current=4
 lt_revision=0
-lt_age=3
+lt_age=4
 LT_LDFLAGS="-version-info ${lt_current}:${lt_revision}:${lt_age} -no-undefined"
 
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])

libusb/version_nano.h

@@ -1 +1 @@
-#define LIBUSB_NANO 11880
+#define LIBUSB_NANO 11881