libpcap: Update to version 1.8.1

- Option --enable-canusb was removed on commit:
    93ca5ff703
  - Autotools class was improved and we can now stop aclocal from running at all.
  - File configure.in was renamed to configure.ac, rework libpcap-pkgconfig-support
    patch and do_configure_prepend task to use configure.ac file.

(From OE-Core rev: 62771b5a426e4b7d38e4997dc3f252a547f481ce)

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/libpcap/libpcap.inc

@@ -19,6 +19,7 @@ BINCONFIG = "${bindir}/pcap-config"
 inherit autotools binconfig-disabled pkgconfig bluetooth
 
 EXTRA_OECONF = "--with-pcap=linux"
+EXTRA_AUTORECONF += "--exclude=aclocal"
 
 PACKAGECONFIG ??= "${@bb.utils.contains('DISTRO_FEATURES', 'bluetooth', '${BLUEZ}', '', d)} \
                    ${@bb.utils.contains('DISTRO_FEATURES', 'ipv6', 'ipv6', '', d)} \
@@ -26,7 +27,6 @@ PACKAGECONFIG ??= "${@bb.utils.contains('DISTRO_FEATURES', 'bluetooth', '${BLUEZ
 PACKAGECONFIG[bluez4] = "--enable-bluetooth,--disable-bluetooth,bluez4"
 # Add a dummy PACKAGECONFIG for bluez5 since it is not supported by libpcap.
 PACKAGECONFIG[bluez5] = ",,"
-PACKAGECONFIG[canusb] = "--enable-canusb,--enable-canusb=no,libusb"
 PACKAGECONFIG[dbus] = "--enable-dbus,--disable-dbus,dbus"
 PACKAGECONFIG[ipv6] = "--enable-ipv6,--disable-ipv6,"
 PACKAGECONFIG[libnl] = "--with-libnl,--without-libnl,libnl"
@@ -36,8 +36,5 @@ CFLAGS_prepend = "-I${S} "
 CXXFLAGS_prepend = "-I${S} "
 
 do_configure_prepend () {
-    if [ ! -e ${S}/acinclude.m4 ]; then
-        cat ${S}/aclocal.m4 > ${S}/acinclude.m4
-    fi
     sed -i -e's,^V_RPATH_OPT=.*$,V_RPATH_OPT=,' ${S}/pcap-config.in
 }