sudo: add pam support

According to DISTRO_FEATURES to add pam support for sudo, and import
configure file from Fedora.

(From OE-Core rev: 1f7e088f2d570d33c2344e32a05193b37a75ea76)

Signed-off-by: Kang Kai <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/sudo/files/sudo.pam

@@ -0,0 +1,6 @@
+#%PAM-1.0
+auth       include      common-auth
+account    include      common-account
+password   include      common-password
+session    required     pam_keyinit.so revoke
+session    required     pam_limits.so

meta/recipes-extended/sudo/sudo_1.8.1p2.bb

@@ -1,11 +1,23 @@
 require sudo.inc
 
-PR = "r0"
+PR = "r1"
 
 SRC_URI = "http://ftp.sudo.ws/sudo/dist/sudo-${PV}.tar.gz \
-           file://libtool.patch"
+           file://libtool.patch \
+           ${@base_contains('DISTRO_FEATURES', 'pam', '${PAM_SRC_URI}', '', d)}"
+
+PAM_SRC_URI = "file://sudo.pam"
 
 SRC_URI[md5sum] = "e8330f0e63b0ecb2e12b5c76922818cc"
 SRC_URI[sha256sum] = "281f90c80547cf22132e351e7f61c25ba4ba9cf393438468f318f9a7884026fb"
 
-EXTRA_OECONF += " --with-pam=no"
+EXTRA_OECONF += " ${@base_contains('DISTRO_FEATURES', 'pam', '--with-pam', '--without-pam', d)}"
+
+do_install_append () {
+	for feature in ${DISTRO_FEATURES}; do
+		if [ "$feature" = "pam" ]; then
+			install -D -m 664 ${WORKDIR}/sudo.pam ${D}/${sysconfdir}/pam.d/sudo
+			break
+		fi
+	done
+}