configure: remove libudev checks

Library is no longer used.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/configure.ac b/configure.ac
index 708c562..e0597c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -451,13 +451,6 @@
 AC_MSG_RESULT([$CAIRO])
 AM_CONDITIONAL(HAVE_CAIRO, [test "x$CAIRO" = xyes])
 
-# For enumerating devices in test case
-PKG_CHECK_MODULES(LIBUDEV, libudev, [HAVE_LIBUDEV=yes], [HAVE_LIBUDEV=no])
-if test "x$HAVE_LIBUDEV" = xyes; then
-   	AC_DEFINE(HAVE_LIBUDEV, 1, [Have libudev support])
-fi
-AM_CONDITIONAL(HAVE_LIBUDEV, [test "x$HAVE_LIBUDEV" = xyes])
-
 # xsltproc for docbook manpages
 AC_ARG_ENABLE([manpages],
               AS_HELP_STRING([--enable-manpages], [enable manpages @<:@default=auto@:>@]),