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/freetype/template

@@ -3,7 +3,7 @@ pkgname=freetype
 version=2.4.6
 patch_args="-Np1"
 distfiles="${NONGNU_SITE}/$pkgname/$pkgname-$version.tar.bz2"
-build_style=gnu_configure
+build_style=gnu-configure
 short_desc="Font rendering engine and library API"
 maintainer="Juan RP <xtraeme@gmail.com>"
 homepage="http://www.freetype.org/"