[PATCH] build: unbreak linkage of m_xt.so

Commit v3.7.0~10 caused the variable new PKG_CONFIG variable never
to be present at the time of calling make, leading to tc/m_xt.so
not linked with -lxtables (result from pkg-config xtables --libs),
that in turn leading to

tc: symbol lookup error: /usr/lib64/tc//m_xt.so: undefined symbol:
xtables_init_all

Fixing that.

Signed-off-by: Jan Engelhardt <redacted>
---
 configure |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 9912114..573ee55 100755
--- a/configure
+++ b/configure

@@ -4,7 +4,6 @@
 INCLUDE=${1:-"$PWD/include"}
 : ${PKG_CONFIG:=pkg-config}
 : ${CC=gcc}
-echo "PKG_CONFIG:=${PKG_CONFIG}" >>Config
 
 # Make a temp directory in build tree.
 TMPDIR=$(mktemp -d config.XXXXXX)

@@ -224,6 +223,7 @@ rm -f $TMPDIR/ipsettest.c $TMPDIR/ipsettest
 }
 
 echo "# Generated config based on" $INCLUDE >Config
+echo "PKG_CONFIG:=${PKG_CONFIG}" >>Config
 
 echo "TC schedulers"
 

-- 
1.7.10.4