meta/conf/layer.conf: Omit most build deps of rpm-sequoia-native

meta/conf/layer.conf: Omit most build deps of rpm-sequoia-native

Omit most of the build dependencies of rpm-sequoia-native as it
needs only OpenSSL, and implicitly, libgcc and the C runtime
to run.

The list of build dependencies were determined by

  $ bitbake -e rpm-sequoia-native 2>&1 | grep ^DEPENDS=
  DEPENDS="pkgconfig-native cargo-native openssl-native python3-native rust-native rust-native"

Omitting these (except openssl-native) can save significant
amount of disk space and it also speeds up packaging into
signed rpms a little.

Omitting rust-native (and implicitly, llvm-native) also avoids
conflicts with different LLVM/CLANG versions, like those found
in meta-clang-revival.

Signed-off-by: Zoltán Böszörményi <zboszor@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>