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/connman/template

@@ -3,7 +3,7 @@ pkgname=connman
 version=0.69
 revision=1
 distfiles="${KERNEL_SITE}/network/$pkgname/$pkgname-$version.tar.bz2"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--enable-pie --enable-polkit
 --enable-ethernet --enable-wifi --enable-bluetooth --enable-openvpn
 --enable-loopback --enable-pacrunner --enable-ntpd --enable-client