postgresql : Fix build using pkg-config for libxml-2.0.

Use package-config instead of binconfig for libxml-2.0.

The pgac_option processing is filtering the output from
the xml-config programming. The pkgconfig output is good
enough to use without such filtering.

Signed-off-by: Philip Balister <philip@balister.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/postgresql/postgresql.inc

@@ -28,6 +28,7 @@ SRC_URI = "http://ftp.postgresql.org/pub/source/v${PV}/${BP}.tar.bz2 \
            file://postgresql.init \
            file://postgresql-bashprofile \
            file://postgresql.pam \
+           file://0001-Use-pkg-config-for-libxml2-detection.patch \
 "
 
 LEAD_SONAME = "libpq.so"