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/serd/template

@@ -3,7 +3,6 @@ pkgname=serd
 version=0.5.0
 homepage="http://drobilla.net/software/serd/"
 distfiles="http://download.drobilla.net/${pkgname}-${version}.tar.bz2"
-build_style=custom-install
 short_desc="Lightweight C library for RDF syntax."
 maintainer="davehome <davehome@redthumb.info.tm>"
 license="ISC"