Update build_style for all templates.

- There's no need to set build_style for custom-install (default).
- gnu_{configure,makefile} renamed to gnu-{configure,makefile}.

srcpkgs/GConf/template

@@ -3,7 +3,7 @@ pkgname=GConf
 version=3.2.0
 revision=1
 distfiles="${GNOME_SITE}/GConf/3.2/GConf-$version.tar.xz"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--without-openldap --with-gtk=3.0 --enable-defaults-service
 --disable-orbit"
 short_desc="A process-transparent configuration system"