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/util-linux/template

@@ -6,7 +6,6 @@ version=${_distver}${_patchver}
 wrksrc=${pkgname}-${version}
 #distfiles="${KERNEL_SITE}/utils/${pkgname}/v${_distver}/${pkgname}-${version}.tar.bz2"
 distfiles="ftp://ftp.infradead.org/pub/${pkgname}/v2.20/${pkgname}-${version}.tar.bz2"
-build_style=custom-install
 short_desc="Miscellaneous linux utilities"
 maintainer="Juan RP <xtraeme@gmail.com>"
 homepage="http://userweb.kernel.org/~kzak/util-linux-ng"