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/libX11/template

@@ -2,7 +2,7 @@
 pkgname=libX11
 version=1.4.4
 distfiles="${XORG_SITE}/lib/$pkgname-$version.tar.bz2"
-build_style=gnu_configure
+build_style=gnu-configure
 configure_args="--enable-ipv6 --enable-xlocaledir --without-xmlto
 --disable-secure-rpc --enable-loadable-i18n"
 short_desc="Base X libraries from modular Xorg X11"