shadow: pass PIE flags at build time.

srcpkgs/shadow/template

@@ -14,10 +14,6 @@ homepage="http://pkg-shadow.alioth.debian.org"
 distfiles="$homepage/releases/$pkgname-$version.tar.bz2"
 checksum=aa32333748d68b58ed3a83625f0165e0f6b9dc4639e6377c9300c6bf4fe978fb
 
-# Build PIE binaries by default.
-CFLAGS="-fPIE"
-LDFLAGS="-pie"
-
 if [ "$CROSS_BUILD" ]; then
 	hostmakedepends="automake libtool gettext-devel"
 	pre_configure() {
@@ -25,12 +21,14 @@ if [ "$CROSS_BUILD" ]; then
 	}
 fi
 
-pre_build() {
+do_build() {
 	# Don't install groups(1), we use the one from coreutils.
 	sed -i 's/groups$(EXEEXT) //' src/Makefile
 	for f in $(find man -name Makefile); do
 		sed -i 's/groups\.1 / /' $f
 	done
+	# Build PIE binaries by default.
+	make CFLAGS+=" -fPIE" LDFLAGS+=" -pie" ${makejobs}
 }
 
 post_install() {