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/network-manager-applet/template

@@ -3,7 +3,7 @@ pkgname=network-manager-applet
 version=0.9.1.90
 revision=2
 distfiles="${GNOME_SITE}/$pkgname/0.9/$pkgname-$version.tar.xz"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--disable-schemas-install
 --with-gconf-schema-file-dir=/usr/share/gconf/schemas --with-bluetooth
 --disable-static"