component/libtirpc,libnsl: initial inclusion

these are dependencies of postfix

component/libnsl/buildout.cfg

+[buildout]
+extends =
+  ../xz-utils/buildout.cfg
+  ../libtirpc/buildout.cfg
+
+[libnsl]
+recipe = slapos.recipe.cmmi
+shared = true
+url = https://github.com/thkukuk/libnsl/releases/download/v1.3.0/libnsl-1.3.0.tar.xz
+md5sum = 9214f674bd0c2bcfdd6c1da0cadb061f
+make-options = 
+  CFLAGS=-I${libtirpc:location}/include/tirpc
+  LDFLAGS='-L${libtirpc:location}/lib -Wl,-rpath=${libtirpc:location}/lib -ltirpc'
+environment =
+  PATH=${xz-utils:location}/bin:%(PATH)s

component/libtirpc/buildout.cfg

+[buildout]
+parts = libtirpc
+
+[libtirpc]
+recipe = slapos.recipe.cmmi
+shared = true
+url = https://downloads.sourceforge.net/libtirpc/libtirpc-1.3.2.tar.bz2
+md5sum = cf4ca51f3fc401bea61c702c69171ab0
+configure-options = --disable-gssapi