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/udev/template

@@ -3,7 +3,7 @@ pkgname=udev
 version=174
 #distfiles="${KERNEL_SITE}/utils/kernel/hotplug/udev-${version}.tar.bz2"
 distfiles="http://people.freedesktop.org/~kay/udev-${version}.tar.bz2"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--sbindir=/sbin --without-selinux --libexecdir=/lib/udev
 --with-rootlibdir=/lib --disable-introspection --enable-edd --enable-floppy
 --with-systemdsystemunitdir=/lib/systemd/system --disable-gudev