postgresql: reset install_bin after installation.

Fixes #3443.

srcpkgs/postgresql/template

@@ -1,7 +1,7 @@
 # Template file for 'postgresql'
 pkgname=postgresql
 version=9.5.1
-revision=1
+revision=2
 build_style=gnu-configure
 make_build_target="world"
 configure_args="--with-openssl --with-python
@@ -54,6 +54,9 @@ post_install() {
 	vinstall ${FILESDIR}/${pkgname}.pam 644 etc/pam.d ${pkgname}
 	vinstall ${DESTDIR}/usr/share/${pkgname}/${pkgname}.conf.sample \
 		644 etc/${pkgname} ${pkgname}.conf
+
+	sed -i 's/install_bin = .*/install_bin = install/g' \
+		${DESTDIR}/usr/lib/postgresql/pgxs/src/Makefile.global
 }
 
 postgresql-doc_package() {