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/ruby/template

@@ -7,7 +7,7 @@ revision=1
 version=${_ruby_ver}${_ruby_distpatchver}
 wrksrc="${pkgname}-${_ruby_distver}"
 distfiles="ftp://ftp.ruby-lang.org/pub/ruby/1.9/$pkgname-${_ruby_distver}.tar.gz"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--enable-shared --disable-rpath"
 short_desc="Ruby programming language"
 maintainer="Juan RP <xtraeme@gmail.com>"