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/recode/template

@@ -3,7 +3,7 @@ pkgname=recode
 version=3.6
 patch_args="-Np1"
 distfiles="${DEBIAN_SITE}/main/r/${pkgname}/${pkgname}_${version}.orig.tar.gz"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--without-included-gettext"
 short_desc="Character set conversion utility"
 maintainer="Juan RP <xtraeme@gmail.com>"