nativesdk/sdk: Update sdk dummy providers

When we migrated rpm v5 -> v4, we lost the ability to drop "per file"
dependencies from the rpm backend for things like "/bin/bash" and
"/usr/bin/env" which meant the sdks were becomming 'bloated'.

This restores the functionality using a dummy package, similarly to
the way the buildtools perl issue was addressed. It also removes
the non-functional old code so as not to confuse people in future.

I ran into this problem trying to filter dependencies to only rpms
a build directly depends upon and it turns out we have some determinism issues
in this area so this is something key to fix.

(From OE-Core rev: 9d490dc01dcedb216129b22cbe17a6c99efc4f5c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/populate_sdk_base.bbclass

@@ -20,6 +20,9 @@ def complementary_globs(featurevar, d):
 SDKIMAGE_FEATURES ??= "dev-pkgs dbg-pkgs ${@bb.utils.contains('DISTRO_FEATURES', 'api-documentation', 'doc-pkgs', '', d)}"
 SDKIMAGE_INSTALL_COMPLEMENTARY = '${@complementary_globs("SDKIMAGE_FEATURES", d)}'
 
+PACKAGE_ARCHS_append_task-populate-sdk = " sdk-provides-dummy-target"
+SDK_PACKAGE_ARCHS += "sdk-provides-dummy-${SDKPKGSUFFIX}"
+
 inherit rootfs_${IMAGE_PKGTYPE}
 
 SDK_DIR = "${WORKDIR}/sdk"
@@ -34,7 +37,8 @@ SDKTARGETSYSROOT = "${SDKPATH}/sysroots/${REAL_MULTIMACH_TARGET_SYS}"
 
 TOOLCHAIN_HOST_TASK ?= "nativesdk-packagegroup-sdk-host packagegroup-cross-canadian-${MACHINE}"
 TOOLCHAIN_HOST_TASK_ATTEMPTONLY ?= ""
-TOOLCHAIN_TARGET_TASK ?= "${@multilib_pkg_extend(d, 'packagegroup-core-standalone-sdk-target')}"
+TOOLCHAIN_TARGET_TASK ?= "${@multilib_pkg_extend(d, 'packagegroup-core-standalone-sdk-target')} \
+                          ${@multilib_pkg_extend(d, 'target-sdk-provides-dummy')}"
 TOOLCHAIN_TARGET_TASK_ATTEMPTONLY ?= ""
 TOOLCHAIN_OUTPUTNAME ?= "${SDK_NAME}-toolchain-${SDK_VERSION}"