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/pm-utils/template

@@ -6,7 +6,7 @@ patch_args="-Np1"
 distfiles="
 http://pm-utils.freedesktop.org/releases/$pkgname-$version.tar.gz
 http://pm-utils.freedesktop.org/releases/pm-quirks-20100619.tar.gz"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--libdir=/usr/lib"
 short_desc="Power Management Utilities"
 maintainer="Juan RP <xtraeme@gmail.com>"