libpam: disable NIS to not link with libtirpc when it is available

I was checking ways to make incremental builds faster so I started using
sstate-cache and SSTATE_MIRRORS. But this gave me some nasty bug:

| Collected errors:
|  * satisfy_dependencies_for: Cannot satisfy the following dependencies
for php-cgi:
|  *    libtirpc1 (>= 0.2.2) *
|  * opkg_install_cmd: Cannot install package php-cgi.

I checked details:

In my previous build libtirpc got built before libpam so libpam found it
and linked. As a result packages depend on libtirpc1 but as there is no
such build dependency sstate handling code did not used libtirpc copy...

(From OE-Core rev: e629bdcd1bcb51f2d2101fb53daeac0bd29ab637)

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/pam/libpam_1.1.5.bb

@@ -9,7 +9,7 @@ SECTION = "base"
 LICENSE = "GPLv2+ | BSD"
 LIC_FILES_CHKSUM = "file://COPYING;md5=ca0395de9a86191a078b8b79302e3083"
 
-PR = "r5"
+PR = "r6"
 
 SRC_URI = "https://fedorahosted.org/releases/l/i/linux-pam/Linux-PAM-${PV}.tar.bz2 \
            file://99_pam \
@@ -28,6 +28,7 @@ DEPENDS = "bison flex flex-native cracklib"
 EXTRA_OECONF = "--with-db-uniquename=_pam \
                 --includedir=${includedir}/security \
                 --libdir=${base_libdir} \
+                --disable-nis \
                 --disable-regenerate-docu"
 
 CFLAGS_append = " -fPIC "