ldns: Fix buildpaths QA issues

MJ: Backported from 'ldns: Upgrade to 1.8.4' commit without the upgrade.

Fix buildpaths QA errors while here

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Armin Kuster <akuster@mvista.com>

meta-oe/recipes-devtools/ldns/ldns_1.8.3.bb

@@ -19,5 +19,6 @@ do_install:append() {
     sed -e 's@[^ ]*-ffile-prefix-map=[^ "]*@@g' \
         -e 's@[^ ]*-fdebug-prefix-map=[^ "]*@@g' \
         -e 's@[^ ]*-fmacro-prefix-map=[^ "]*@@g' \
-        -i ${D}${libdir}/pkgconfig/*.pc
+        -e 's@${RECIPE_SYSROOT}@@g' \
+        -i ${D}${libdir}/pkgconfig/*.pc ${D}${bindir}/ldns-config
 }