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/libraw/template

@@ -4,7 +4,7 @@ version=0.14.1
 wrksrc=LibRaw-${version}
 homepage="http://www.libraw.org"
 distfiles="${homepage}/data/LibRaw-${version}.tar.gz"
-build_style=gnu_configure
+build_style=gnu-configure
 short_desc="Raw image decoder library"
 maintainer="Juan RP <xtraeme@gmail.com>"
 license="GPL-2, CDDL, ${pkgname}"