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/glib/template

@@ -3,7 +3,7 @@ pkgname=glib
 version=2.30.1
 distfiles="${GNOME_SITE}/glib/2.30/glib-$version.tar.xz"
 configure_args="--disable-fam --with-pcre=system"
-build_style=gnu_configure
+build_style=gnu-configure
 short_desc="The GNU library of C routines"
 maintainer="Juan RP <xtraeme@gmail.com>"
 homepage="http://www.gtk.org/"